profit.c

      parammax = 11.0;
      break;
    case PARAM_BAR_FLUX:
      param = obj2->flux_auto/10.0;
      parammin = 0.0;
      parammax = 2.0*obj2->flux_auto;
      break;
    case PARAM_BAR_ASPECT:
      param = 0.3;
      parammin = 0.2;
      parammax = 0.5;
      break;
    case PARAM_BAR_POSANG:
      param = 0.0;
      parammin = 0.0;
      parammax = 0.0;
      break;
    case PARAM_INRING_FLUX:
      param = obj2->flux_auto/10.0;
      parammin = 0.0;
      parammax = 2.0*obj2->flux_auto;
      break;
    case PARAM_INRING_WIDTH:
      param = 0.3;
      parammin = 0.0;
      parammax = 0.5;
      break;
    case PARAM_INRING_ASPECT:
      param = 0.8;
      parammin = 0.4;
      parammax = 1.0;
      break;
    case PARAM_OUTRING_FLUX:
      param = obj2->flux_auto/10.0;
      parammin = 0.0;
      parammax = 2.0*obj2->flux_auto;
      break;
    case PARAM_OUTRING_START:
      param = 4.0;
      parammin = 3.5;
      parammax = 6.0;
      break;
    case PARAM_OUTRING_WIDTH:
      param = 0.3;
      parammin = 0.0;
      parammax = 0.5;
      break;
    default:
      error(EXIT_FAILURE, "*Internal Error*: Unknown profile parameter in ",
		"profit_resetparam()");
      break;
   }

  if (parammin!=parammax && (param<=parammin || param>=parammax))
    param = (parammin+parammax)/2.0;
  profit_setparam(profit, paramtype, param, parammin, parammax);

  return;
  }


/****** profit_resetparams ****************************************************
PROTO	void profit_resetparams(profitstruct *profit)
PURPOSE	Set the initial, lower and upper boundary values of profile parameters.
INPUT	Pointer to the profit structure.
OUTPUT	-.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	18/09/2008
 ***/
void	profit_resetparams(profitstruct *profit)
  {
   int		p;


  for (p=0; p<PARAM_NPARAM; p++)
    profit_resetparam(profit, (paramenum)p);

  return;
  }


/****** profit_setparam ****************************************************
PROTO	void profit_setparam(profitstruct *profit, paramenum paramtype,
		float param, float parammin, float parammax)
PURPOSE	Set the actual, lower and upper boundary values of a profile parameter.
INPUT	Pointer to the profit structure,
	Parameter index,
	Actual value,
	Lower boundary to the parameter,
	Upper boundary to the parameter.
OUTPUT	RETURN_OK if the parameter is registered, RETURN_ERROR otherwise.
AUTHOR	E. Bertin (IAP)
VERSION	15/03/2009
 ***/
int	profit_setparam(profitstruct *profit, paramenum paramtype,
		float param, float parammin, float parammax)
  {
   float	*paramptr;
   int		index;

/* Check whether the parameter has already be registered */
  if ((paramptr=profit->paramlist[(int)paramtype]))
    {
    index = profit->paramindex[(int)paramtype];
    profit->paraminit[index] = param;
    profit->parammin[index] = parammin;
    profit->parammax[index] = parammax;
    return RETURN_OK;
    }
  else
    return RETURN_ERROR;
  }

  
/****** profit_boundtounbound *************************************************
PROTO	void profit_boundtounbound(profitstruct *profit, float *param)
PURPOSE	Convert parameters from bounded to unbounded space.
INPUT	Pointer to the profit structure.
OUTPUT	-.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	07/09/2009
 ***/
void	profit_boundtounbound(profitstruct *profit, float *param)
  {
   double	num,den;
   int		p;

  for (p=0; p<profit->nparam; p++)
    if (profit->parammin[p]!=profit->parammax[p])
      {
      num = param[p] - profit->parammin[p];
      den = profit->parammax[p] - param[p];
      param[p] = num>1e-50? (den>1e-50? log(num/den): 50.0) : -50.0;
      }

  return;

  }


/****** profit_unboundtobound *************************************************
PROTO	void profit_unboundtobound(profitstruct *profit, float *param)
PURPOSE	Convert parameters from unbounded to bounded space.
INPUT	Pointer to the profit structure.
OUTPUT	-.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	18/05/2009
 ***/
void	profit_unboundtobound(profitstruct *profit, float *param)
  {
   int		p;

  for (p=0; p<profit->nparam; p++)
    if (profit->parammin[p]!=profit->parammax[p])
      param[p] = (profit->parammax[p] - profit->parammin[p])
		/ (1.0 + exp(-(param[p]>50.0? 50.0 : param[p])))
		+ profit->parammin[p];

  return;
  }


/****** profit_covarunboundtobound ********************************************
PROTO	void profit_covarunboundtobound(profitstruct *profit)
PURPOSE	Convert covariance matrix from unbounded to bounded space.
INPUT	Pointer to the profit structure.
OUTPUT	-.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	02/10/2009
 ***/
void	profit_covarunboundtobound(profitstruct *profit)
  {
   double	*dxdy,
		dxmin,dxmax;
   float	*covar, *x,*xmin,*xmax;
   int		p,p1,p2, nparam;

  nparam = profit->nparam;
  QMALLOC16(dxdy, double, nparam);
  x = profit->paraminit;
  xmin = profit->parammin;
  xmax = profit->parammax;
  for (p=0; p<profit->nparam; p++)
    if (xmin[p]!=xmax[p])
      {
      dxmin = x[p] - xmin[p];
      dxmax= xmax[p] - x[p];
      dxdy[p] = (fabs(dxmin) < 1.0/BIG && fabs(dxmax) < 1.0/BIG) ?
		0.0 : dxmin*dxmax/(dxmin+dxmax);
      }
    else
      dxdy[p] = 1.0;

  covar = profit->covar;
  for (p2=0; p2<nparam; p2++)
    for (p1=0; p1<nparam; p1++)
      *(covar++) *= (float)(dxdy[p1]*dxdy[p2]);

  free(dxdy);

  return;
  }


/****** prof_init *************************************************************
PROTO	profstruct prof_init(profitstruct *profit, proftypenum profcode)
PURPOSE	Allocate and initialize a new profile structure.
INPUT	Pointer to the profile-fitting structure,
	profile type.
OUTPUT	A pointer to an allocated prof structure.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	22/04/2008
 ***/
profstruct	*prof_init(profitstruct *profit, proftypenum profcode)
  {
   profstruct	*prof;
   float	*pix,
		rmax2, re2, dy2,r2, scale, zero, k,n, hinvn;
   int		width,height, ixc,iyc, ix,iy, nsub,
		d,s;

  QCALLOC(prof, profstruct, 1);
  prof->code = profcode;
  switch(profcode)
    {
    case PROF_BACK:
      prof->naxis = 2;
      prof->pix = NULL;
      profit_addparam(profit, PARAM_BACK, &prof->flux);
      prof->typscale = 1.0;
      break;
    case PROF_SERSIC:
      prof->naxis = 3;
      prof->pix = NULL;
      prof->typscale = 1.0;
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_SPHEROID_FLUX, &prof->flux);
      profit_addparam(profit, PARAM_SPHEROID_REFF, &prof->scale);
      profit_addparam(profit, PARAM_SPHEROID_ASPECT, &prof->aspect);
      profit_addparam(profit, PARAM_SPHEROID_POSANG, &prof->posangle);
      profit_addparam(profit, PARAM_SPHEROID_SERSICN, &prof->extra[0]);
      break;
    case PROF_DEVAUCOULEURS:
      prof->naxis = 2;
      prof->pix = NULL;
      prof->typscale = 1.0;
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_SPHEROID_FLUX, &prof->flux);
      profit_addparam(profit, PARAM_SPHEROID_REFF, &prof->scale);
      profit_addparam(profit, PARAM_SPHEROID_ASPECT, &prof->aspect);
      profit_addparam(profit, PARAM_SPHEROID_POSANG, &prof->posangle);
      break;
    case PROF_EXPONENTIAL:
      prof->naxis = 2;
      prof->pix = NULL;
      prof->typscale = 1.0;
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_DISK_FLUX, &prof->flux);
      profit_addparam(profit, PARAM_DISK_SCALE, &prof->scale);
      profit_addparam(profit, PARAM_DISK_ASPECT, &prof->aspect);
      profit_addparam(profit, PARAM_DISK_POSANG, &prof->posangle);
      break;
    case PROF_ARMS:
      prof->naxis = 2;
      prof->pix = NULL;
      prof->typscale = 1.0;
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_DISK_SCALE, &prof->scale);
      profit_addparam(profit, PARAM_DISK_ASPECT, &prof->aspect);
      profit_addparam(profit, PARAM_DISK_POSANG, &prof->posangle);
      profit_addparam(profit, PARAM_ARMS_FLUX, &prof->flux);
      profit_addparam(profit, PARAM_ARMS_QUADFRAC, &prof->featfrac);
//      profit_addparam(profit, PARAM_ARMS_SCALE, &prof->featscale);
      profit_addparam(profit, PARAM_ARMS_START, &prof->featstart);
      profit_addparam(profit, PARAM_ARMS_PITCH, &prof->featpitch);
//      profit_addparam(profit, PARAM_ARMS_PITCHVAR, &prof->featpitchvar);
      profit_addparam(profit, PARAM_ARMS_POSANG, &prof->featposang);
//      profit_addparam(profit, PARAM_ARMS_WIDTH, &prof->featwidth);
      break;
    case PROF_BAR:
      prof->naxis = 2;
      prof->pix = NULL;
      prof->typscale = 1.0;
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_DISK_SCALE, &prof->scale);
      profit_addparam(profit, PARAM_DISK_ASPECT, &prof->aspect);
      profit_addparam(profit, PARAM_DISK_POSANG, &prof->posangle);
      profit_addparam(profit, PARAM_ARMS_START, &prof->featstart);
      profit_addparam(profit, PARAM_BAR_FLUX, &prof->flux);
      profit_addparam(profit, PARAM_BAR_ASPECT, &prof->feataspect);
      profit_addparam(profit, PARAM_ARMS_POSANG, &prof->featposang);
      break;
    case PROF_INRING:
      prof->naxis = 2;
      prof->pix = NULL;
      prof->typscale = 1.0;
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_DISK_SCALE, &prof->scale);
      profit_addparam(profit, PARAM_DISK_ASPECT, &prof->aspect);
      profit_addparam(profit, PARAM_DISK_POSANG, &prof->posangle);
      profit_addparam(profit, PARAM_ARMS_START, &prof->featstart);
      profit_addparam(profit, PARAM_INRING_FLUX, &prof->flux);
      profit_addparam(profit, PARAM_INRING_WIDTH, &prof->featwidth);
      profit_addparam(profit, PARAM_INRING_ASPECT, &prof->feataspect);
      break;
    case PROF_OUTRING:
      prof->naxis = 2;
      prof->pix = NULL;
      prof->typscale = 1.0;
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_DISK_SCALE, &prof->scale);
      profit_addparam(profit, PARAM_DISK_ASPECT, &prof->aspect);
      profit_addparam(profit, PARAM_DISK_POSANG, &prof->posangle);
      profit_addparam(profit, PARAM_OUTRING_START, &prof->featstart);
      profit_addparam(profit, PARAM_OUTRING_FLUX, &prof->flux);
      profit_addparam(profit, PARAM_OUTRING_WIDTH, &prof->featwidth);
      break;
    case PROF_DIRAC:
      prof->naxis = 2;
      prof->pix = NULL;
      prof->typscale = 1.0;
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_DISK_FLUX, &prof->flux);
      break;
    case PROF_SERSIC_TABEX:	/* An example of tabulated profile */
      prof->naxis = 3;
      width =  prof->naxisn[0] = PROFIT_PROFRES;
      height = prof->naxisn[1] = PROFIT_PROFRES;
      nsub = prof->naxisn[2] = PROFIT_PROFSRES;
      QCALLOC(prof->pix, float, width*height*nsub);
      ixc = width/2;
      iyc = height/2;
      rmax2 = (ixc - 1.0)*(ixc - 1.0);
      re2 = width/64.0;
      prof->typscale = re2;
      re2 *= re2;
      zero = prof->extrazero[0] = 0.2;
      scale = prof->extrascale[0]= 8.0/PROFIT_PROFSRES;
      pix = prof->pix;
      for (s=0; s<nsub; s++)
        {
        n = s*scale + zero;
        hinvn = 0.5/n;
        k = -1.0/3.0 + 2.0*n + 4.0/(405.0*n) + 46.0/(25515.0*n*n)
		+ 131.0/(1148175*n*n*n);
        for (iy=0; iy<height; iy++)
          {
          dy2 = (iy-iyc)*(iy-iyc);
          for (ix=0; ix<width; ix++)
            {
            r2 = dy2 + (ix-ixc)*(ix-ixc);
            *(pix++) = (r2<rmax2)? exp(-k*pow(r2/re2,hinvn)) : 0.0;
            }
          }
        }
      profit_addparam(profit, PARAM_X, &prof->x[0]);
      profit_addparam(profit, PARAM_Y, &prof->x[1]);
      profit_addparam(profit, PARAM_SPHEROID_FLUX, &prof->flux);
      profit_addparam(profit, PARAM_SPHEROID_REFF, &prof->scale);
      profit_addparam(profit, PARAM_SPHEROID_ASPECT, &prof->aspect);
      profit_addparam(profit, PARAM_SPHEROID_POSANG, &prof->posangle);
      profit_addparam(profit, PARAM_SPHEROID_SERSICN, &prof->extra[0]);
      break;
    default:
      error(EXIT_FAILURE, "*Internal Error*: Unknown profile in ",
		"prof_init()");
      break;
    }

  if (prof->pix)
    {
    prof->kernelnlines = 1;
    for (d=0; d<prof->naxis; d++)
      {
      prof->interptype[d] = INTERP_BILINEAR;
      prof->kernelnlines *= 
	(prof->kernelwidth[d] = interp_kernwidth[prof->interptype[d]]);
      }
    prof->kernelnlines /= prof->kernelwidth[0];
    QMALLOC16(prof->kernelbuf, float, prof->kernelnlines);
    }

  return prof;
  }  


/****** prof_end **************************************************************
PROTO	void prof_end(profstruct *prof)
PURPOSE	End (deallocate) a profile structure.
INPUT	Prof structure.
OUTPUT	-.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	09/04/2007
 ***/
void	prof_end(profstruct *prof)
  {
  if (prof->pix)
    {
    free(prof->pix);
    free(prof->kernelbuf);
    }
  free(prof);

  return;
  }


/****** prof_add **************************************************************
PROTO	float prof_add(profstruct *prof, profitstruct *profit)
PURPOSE	Add a model profile to an image.
INPUT	Profile structure,
	profile-fitting structure.
OUTPUT	Corrected flux contribution.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	09/10/2009
 ***/
float	prof_add(profstruct *prof, profitstruct *profit)
  {
   double	xscale, yscale, saspect, ctheta,stheta, flux, scaling, bn, n;
   float	posin[PROFIT_MAXEXTRA], posout[2], dnaxisn[2],
		*pixin, *pixin2, *pixout,
		fluxfac, amp,cd11,cd12,cd21,cd22, dcd11,dcd21, dx1,dx2,
		x1,x10,x2, x1cin,x2cin, x1cout,x2cout, x1max,x2max,
		x1in,x2in, odx, ostep,
		k, hinvn, x1t,x2t, ca,sa, u,umin,
		armamp,arm2amp, armrdphidr, armrdphidrvar, posang,
		width, invwidth2,
		r,r2,rmin, r2minxin,r2minxout, rmax, r2max,
		r2max1, r2max2, r2min, invr2xdif,
		val, theta, thresh, ra,rb,rao, num;
   int		npix, noversamp, threshflag,
		d,e,i, ix1,ix2, idx1,idx2, nx2, npix2;

  npix = profit->modnaxisn[0]*profit->modnaxisn[1];

  if (prof->code==PROF_BACK)
    {
    amp = fabs(*prof->flux);
    pixout = profit->modpix;
    for (i=npix; i--;)
      *(pixout++) += amp;
    prof->lostfluxfrac = 0.0;
    return 0.0;
    }

  scaling = profit->pixstep / prof->typscale;

  if (prof->code!=PROF_DIRAC)
    {
/*-- Compute Profile CD matrix */
    ctheta = cos(*prof->posangle*DEG);
    stheta = sin(*prof->posangle*DEG);
    saspect = fabs(*prof->aspect);
    xscale = (*prof->scale==0.0)?
		0.0 : fabs(scaling / (*prof->scale*prof->typscale));
    yscale = (*prof->scale*saspect == 0.0)?
		0.0 : fabs(scaling / (*prof->scale*prof->typscale*saspect));
    cd11 = (float)(xscale*ctheta);
    cd12 = (float)(xscale*stheta);
    cd21 = (float)(-yscale*stheta);
    cd22 = (float)(yscale*ctheta);
    dx1 = 0.0;	/* Shifting operations have been moved to profit_resample() */
    dx2 = 0.0;	/* Shifting operations have been moved to profit_resample() */

    x1cout = (float)(profit->modnaxisn[0]/2);
    x2cout = (float)(profit->modnaxisn[1]/2);
    nx2 = profit->modnaxisn[1]/2 + 1;

/*-- Compute the largest r^2 that fits in the frame */
    num = cd11*cd22-cd12*cd21;
    x1max = x1cout - 1.0;
    x2max = x2cout - 1.0;
    r2max1 = x1max*x1max*fabs(num*num / (cd12*cd12+cd22*cd22));
    r2max2 = x2max*x2max*fabs(num*num / (cd11*cd11+cd21*cd21));
    r2max = r2max1 < r2max2? r2max1 : r2max2;
    }

  switch(prof->code)
    {
    case PROF_SERSIC:
      n = fabs(*prof->extra[0]);
      bn = 2.0*n - 1.0/3.0 + 4.0/(405.0*n) + 46.0/(25515.0*n*n)
		+ 131.0/(1148175*n*n*n);	/* Ciotti & Bertin 1999 */
      k = -bn;
      hinvn = 0.5/n;
/*---- The consequence of sampling on flux is compensated by PSF normalisation*/
      x10 = -x1cout - dx1;
      x2 = -x2cout - dx2;
      pixin = profit->pmodpix;
      for (ix2=nx2; ix2--; x2+=1.0)
        {
        x1 = x10;
        for (ix1=profit->modnaxisn[0]; ix1--; x1+=1.0)
          {
          x1in = cd12*x2 + cd11*x1;
          x2in = cd22*x2 + cd21*x1;
          ra = x1in*x1in+x2in*x2in;
          if (ra>r2max)
            {
            *(pixin++) = 0.0;
            continue;
            }
          val = expf(k*expf(logf(ra)*hinvn));
          noversamp  = (int)(val*PROFIT_OVERSAMP+0.1);
          if (noversamp < 2)
            *(pixin++) = val;
          else
            {
            ostep = 1.0/noversamp;
            dcd11 = cd11*ostep;
            dcd21 = cd21*ostep;
            odx = 0.5*(ostep-1.0);
            x1t = x1+odx;
            val = 0.0;
            for (idx2=noversamp; idx2--; odx+=ostep)
              {
              x1in = cd12*(x2+odx) + cd11*x1t;
              x2in = cd22*(x2+odx) + cd21*x1t;
              for (idx1=noversamp; idx1--;)
                {
                rao = x1in*x1in+x2in*x2in;
                val += expf(k*PROFIT_POWF(rao,hinvn));
                x1in += dcd11;
                x2in += dcd21;
                }
              }
            *(pixin++) = val*ostep*ostep;
            }
          }
        }
/*---- Copy the symmetric part */
      if ((npix2=(profit->modnaxisn[1]-nx2)*profit->modnaxisn[0]) > 0)
        {
        pixin2 = pixin - profit->modnaxisn[0];
        for (i=npix2; i--;)
          *(pixin++) = *(pixin2--);
        }
      prof->lostfluxfrac = 1.0 - prof_gammainc(2.0*n, bn*pow(r2max, hinvn));
      threshflag = 0;
      break;
    case PROF_DEVAUCOULEURS:
/*---- The consequence of sampling on flux is compensated by PSF normalisation*/
      x10 = -x1cout - dx1;
      x2 = -x2cout - dx2;
      pixin = profit->pmodpix;
      for (ix2=nx2; ix2--; x2+=1.0)
        {
        x1 = x10;
        for (ix1=profit->modnaxisn[0]; ix1--; x1+=1.0)
          {
          x1in = cd12*x2 + cd11*x1;
          x2in = cd22*x2 + cd21*x1;
          ra = x1in*x1in+x2in*x2in;
          if (ra>r2max)
            {
            *(pixin++) = 0.0;
            continue;
            }
          val = expf(-7.66924944f*PROFIT_POWF(ra,0.125));
          noversamp  = (int)(sqrt(val)*PROFIT_OVERSAMP+0.1);
          if (noversamp < 2)
            *(pixin++) = val;
          else
            {
            ostep = 1.0/noversamp;
            dcd11 = cd11*ostep;
            dcd21 = cd21*ostep;
            odx = 0.5*(ostep-1.0);
            x1t = x1+odx;
            val = 0.0;
            for (idx2=noversamp; idx2--; odx+=ostep)
              {
              x1in = cd12*(x2+odx) + cd11*x1t;
              x2in = cd22*(x2+odx) + cd21*x1t;
              for (idx1=noversamp; idx1--;)
                {
                ra = x1in*x1in+x2in*x2in;
                val += expf(-7.66924944f*PROFIT_POWF(ra,0.125));
                x1in += dcd11;
                x2in += dcd21;
                }
              }
            *(pixin++) = val*ostep*ostep;
            }
          }
        }
/*---- Copy the symmetric part */
      if ((npix2=(profit->modnaxisn[1]-nx2)*profit->modnaxisn[0]) > 0)
        {
        pixin2 = pixin - profit->modnaxisn[0];
        for (i=npix2; i--;)
          *(pixin++) = *(pixin2--);
        }
      prof->lostfluxfrac = 1.0-prof_gammainc(8.0, 7.66924944*pow(r2max, 0.125));
      threshflag = 0;
      break;
    case PROF_EXPONENTIAL:
      x10 = -x1cout - dx1;
      x2 = -x2cout - dx2;
      pixin = profit->pmodpix;
      for (ix2=nx2; ix2--; x2+=1.0)
        {
        x1 = x10;
        for (ix1=profit->modnaxisn[0]; ix1--; x1+=1.0)
          {
          x1in = cd12*x2 + cd11*x1;
          x2in = cd22*x2 + cd21*x1;
          ra = x1in*x1in+x2in*x2in;
          if (ra>r2max)
            {
            *(pixin++) = 0.0;
            continue;
            }
          val = expf(-sqrtf(ra));
          noversamp  = (int)(val*sqrt(PROFIT_OVERSAMP)+0.1);
          if (noversamp < 2)
            *(pixin++) = val;
          else
            {
            ostep = 1.0/noversamp;
            dcd11 = cd11*ostep;
            dcd21 = cd21*ostep;
            odx = 0.5*(ostep-1.0);
            x1t = x1+odx;
            val = 0.0;
            for (idx2=noversamp; idx2--; odx+=ostep)
              {
              x1in = cd12*(x2+odx) + cd11*x1t;
              x2in = cd22*(x2+odx) + cd21*x1t;
              for (idx1=noversamp; idx1--;)
                {
                ra = x1in*x1in+x2in*x2in;
                val += expf(-sqrtf(ra));
                x1in += dcd11;
                x2in += dcd21;
                }
              }
            *(pixin++) = val*ostep*ostep;
            }
          }
        }
/*---- Copy the symmetric part */
      if ((npix2=(profit->modnaxisn[1]-nx2)*profit->modnaxisn[0]) > 0)
        {
        pixin2 = pixin - profit->modnaxisn[0];
        for (i=npix2; i--;)
          *(pixin++) = *(pixin2--);
        }
      rmax = sqrt(r2max);
      prof->lostfluxfrac = (1.0 + rmax)*exp(-rmax);
      threshflag = 0;
      break;
    case PROF_ARMS:
      r2min = *prof->featstart**prof->featstart;
      r2minxin = r2min * (1.0 - PROFIT_BARXFADE) * (1.0 - PROFIT_BARXFADE);
      r2minxout = r2min * (1.0 + PROFIT_BARXFADE) * (1.0 + PROFIT_BARXFADE);
      if ((invr2xdif = (r2minxout - r2minxin)) > 0.0)
        invr2xdif = 1.0 / invr2xdif;
      else
        invr2xdif = 1.0;
      umin = 0.5*logf(r2minxin + 0.00001);
      arm2amp = *prof->featfrac;
      armamp = 1.0 - arm2amp;
      armrdphidr = 1.0/tan(*prof->featpitch*DEG);
      armrdphidrvar = 0.0 /**prof->featpitchvar*/;
      posang = *prof->featposang*DEG;
      width = fabs(*prof->featwidth);
width = 3.0;
      x1 = -x1cout - dx1;
      x2 = -x2cout - dx2;
      pixin = profit->pmodpix;
      for (ix2=profit->modnaxisn[1]; ix2--; x2+=1.0)
        {
        x1t = cd12*x2 + cd11*x1;
        x2t = cd22*x2 + cd21*x1;
        for (ix1=profit->modnaxisn[0]; ix1--;)
          {
          r2 = x1t*x1t+x2t*x2t;
          if (r2>r2minxin)
            {
            u = 0.5*logf(r2 + 0.00001);
            theta = (armrdphidr+armrdphidrvar*(u-umin))*u+posang;
            ca = cosf(theta);
            sa = sinf(theta);
            x1in = (x1t*ca - x2t*sa);
            x2in = (x1t*sa + x2t*ca);
            amp = expf(-sqrtf(x1t*x1t+x2t*x2t));
            if (r2<r2minxout)
              amp *= (r2 - r2minxin)*invr2xdif;
            ra = x1in*x1in/r2;
            rb = x2in*x2in/r2;
            *(pixin++) = amp * (armamp*PROFIT_POWF(ra,width)
				+ arm2amp*PROFIT_POWF(rb,width));
            }
          else
            *(pixin++) = 0.0;
          x1t += cd11;
          x2t += cd21; 
         }
        }
      prof->lostfluxfrac = 0.0;
      threshflag = 1;
      break;
    case PROF_BAR:
      r2min = *prof->featstart**prof->featstart;
      r2minxin = r2min * (1.0 - PROFIT_BARXFADE) * (1.0 - PROFIT_BARXFADE);
      r2minxout = r2min * (1.0 + PROFIT_BARXFADE) * (1.0 + PROFIT_BARXFADE);
      if ((invr2xdif = (r2minxout - r2minxin)) > 0.0)
        invr2xdif = 1.0 / invr2xdif;
      else
        invr2xdif = 1.0;
      invwidth2 = fabs(1.0 / (*prof->featstart**prof->feataspect));
      posang = *prof->featposang*DEG;
      ca = cosf(posang);
      sa = sinf(posang);
      x1 = -x1cout - dx1;
      x2 = -x2cout - dx2;
      pixin = profit->pmodpix;
      for (ix2=profit->modnaxisn[1]; ix2--; x2+=1.0)
        {
        x1t = cd12*x2 + cd11*x1;
        x2t = cd22*x2 + cd21*x1;
        for (ix1=profit->modnaxisn[0]; ix1--;)
          {
          r2 = x1t*x1t+x2t*x2t;
          if (r2<r2minxout)
            {
            x1in = x1t*ca - x2t*sa;
            x2in = invwidth2*(x1t*sa + x2t*ca);
            *(pixin++) = (r2>r2minxin) ?
				(r2minxout - r2)*invr2xdif*expf(-x2in*x2in)
				: expf(-x2in*x2in);
            }
          else
            *(pixin++) = 0.0;
          x1t += cd11;
          x2t += cd21;
          }
        }
      prof->lostfluxfrac = 0.0;
      threshflag = 1;
      break;
    case PROF_INRING:
      rmin = *prof->featstart;
      r2minxin = *prof->featstart-4.0**prof->featwidth;
      if (r2minxin < 0.0)
        r2minxin = 0.0;
      r2minxin *= r2minxin;
      r2minxout = *prof->featstart+4.0**prof->featwidth;
      r2minxout *= r2minxout;
      invwidth2 = 0.5 / (*prof->featwidth**prof->featwidth);
      cd22 /= *prof->feataspect;
      cd21 /= *prof->feataspect;
      x1 = -x1cout - dx1;
      x2 = -x2cout - dx2;
      pixin = profit->pmodpix;
      for (ix2=profit->modnaxisn[1]; ix2--; x2+=1.0)
        {
        x1t = cd12*x2 + cd11*x1;
        x2t = cd22*x2 + cd21*x1;
        for (ix1=profit->modnaxisn[0]; ix1--;)
          {
          r2 = x1t*x1t+x2t*x2t;
          if (r2>r2minxin && r2<r2minxout)
            {
            r = sqrt(r2) - rmin;
            *(pixin++) = expf(-invwidth2*r*r);
            }
          else
            *(pixin++) = 0.0;
          x1t += cd11;
          x2t += cd21;
          }
        }
      prof->lostfluxfrac = 0.0;
      threshflag = 1;
      break;
    case PROF_OUTRING:
      rmin = *prof->featstart;
      r2minxin = *prof->featstart-4.0**prof->featwidth;
      if (r2minxin < 0.0)
        r2minxin = 0.0;
      r2minxin *= r2minxin;
      r2minxout = *prof->featstart+4.0**prof->featwidth;
      r2minxout *= r2minxout;
      invwidth2 = 0.5 / (*prof->featwidth**prof->featwidth);
      x1 = -x1cout - dx1;
      x2 = -x2cout - dx2;
      pixin = profit->pmodpix;
      for (ix2=profit->modnaxisn[1]; ix2--; x2+=1.0)
        {
        x1t = cd12*x2 + cd11*x1;
        x2t = cd22*x2 + cd21*x1;
        for (ix1=profit->modnaxisn[0]; ix1--;)
          {
          r2 = x1t*x1t+x2t*x2t;
          if (r2>r2minxin && r2<r2minxout)
            {
            r = sqrt(r2) - rmin;
            *(pixin++) = expf(-invwidth2*r*r);
            }
          else
            *(pixin++) = 0.0;
          x1t += cd11;
          x2t += cd21;
          }
        }
      prof->lostfluxfrac = 0.0;
      threshflag = 1;
      break;
    case PROF_DIRAC:
      memset(profit->pmodpix, 0,
	profit->modnaxisn[0]*profit->modnaxisn[1]*sizeof(float));
      profit->pmodpix[profit->modnaxisn[0]/2
		+ (profit->modnaxisn[1]/2)*profit->modnaxisn[0]] = 1.0;
      prof->lostfluxfrac = 0.0;
      threshflag = 0;
      break;
    default:
/*---- Tabulated profile: remap each pixel */
/*---- Initialize multi-dimensional counters */
     for (d=0; d<2; d++)
        {
        posout[d] = 1.0;	/* FITS convention */
        dnaxisn[d] = profit->modnaxisn[d] + 0.99999;
        }

      for (e=0; e<prof->naxis - 2; e++)
        {
        d = 2+e;
/*------ Compute position along axis */
        posin[d] = (*prof->extra[e]-prof->extrazero[e])/prof->extrascale[e]+1.0;
/*------ Keep position within boundaries and let interpolation do the rest */
        if (posin[d] < 0.99999)
          {
          if (prof->extracycleflag[e])
            posin[d] += (float)prof->naxisn[d];
          else
            posin[d] = 1.0;
          }
        else if (posin[d] > (float)prof->naxisn[d])
          {
          if (prof->extracycleflag[e])
          posin[d] = (prof->extracycleflag[e])?
		  fmod(posin[d], (float)prof->naxisn[d])
		: (float)prof->naxisn[d];
          }
        }
      x1cin = (float)(prof->naxisn[0]/2);
      x2cin = (float)(prof->naxisn[1]/2);
      pixin = profit->pmodpix;
      for (i=npix; i--;)
        {
        x1 = posout[0] - x1cout - 1.0 - dx1;
        x2 = posout[1] - x2cout - 1.0 - dx2;
        posin[0] = cd11*x1 + cd12*x2 + x1cin + 1.0;
        posin[1] = cd21*x1 + cd22*x2 + x2cin + 1.0;
        *(pixin++) = prof_interpolate(prof, posin);
        for (d=0; d<2; d++)
          if ((posout[d]+=1.0) < dnaxisn[d])
            break;
          else
            posout[d] = 1.0;
        }
      prof->lostfluxfrac = 0.0;
      threshflag = 1;
    break;
    }

/* For complex profiles, threshold to the brightest pixel value at border */
  if (threshflag)
    {
/*-- Now find truncation threshold */
/*-- Find the shortest distance to a vignet border */
    rmax = x1cout;
    if (rmax > (r = x2cout))
      rmax = r;
    rmax += 0.01;
    if (rmax<1.0)
      rmax = 1.0;
    r2max = rmax*rmax;
    rmin = rmax - 1.0;
    r2min = rmin*rmin;

/*-- Find best threshold (the max around the circle with radius rmax */
    dx2 = -x2cout;
    pixin = profit->pmodpix;
    thresh = -BIG;
    for (ix2=profit->modnaxisn[1]; ix2--; dx2 += 1.0)
      {
      dx1 = -x1cout;
      for (ix1=profit->modnaxisn[0]; ix1--; dx1 += 1.0)
        if ((val=*(pixin++))>thresh && (r2=dx1*dx1+dx2*dx2)>r2min && r2<r2max)
          thresh = val;
      }

/*-- Threshold and measure the flux */
    flux = 0.0;
    pixin = profit->pmodpix;
    for (i=npix; i--; pixin++)
      if (*pixin >= thresh)
        flux += (double)*pixin;
      else
        *pixin = 0.0;
    }
  else
    {
    flux = 0.0;
    pixin = profit->pmodpix;
    for (i=npix; i--;)
      flux += (double)*(pixin++);
    }

  if (prof->lostfluxfrac < 1.0)
    flux /= (1.0 - prof->lostfluxfrac);

/* Correct final flux */
  fluxfac = profit->fluxfac ;
  fluxfac *= fabs(flux)>0.0? *prof->flux / flux : 1.0;
//  prof->fluxfac = fluxfac;
  pixin = profit->pmodpix;
  pixout = profit->modpix;
  for (i=npix; i--;)
    *(pixout++) += fluxfac * *(pixin++);

  return *prof->flux;
  }


/****** prof_interpolate ******************************************************
PROTO	float	prof_interpolate(profstruct *prof, float *posin)
PURPOSE	Interpolate a multidimensional model profile at a given position.
INPUT	Profile structure,
	input position vector.
OUTPUT	-.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	10/12/2006
 ***/
static float	prof_interpolate(profstruct *prof, float *posin)
  {
   float		dpos[2+PROFIT_MAXEXTRA],
			kernel_vector[INTERP_MAXKERNELWIDTH],
			*kvector, *pixin,*pixout,
			val;
   long			step[2+PROFIT_MAXEXTRA],
			start, fac;
   int			linecount[2+PROFIT_MAXEXTRA],
			*naxisn,
			i,j,n, ival, nlines, kwidth,width, badpixflag, naxis;

  naxis = prof->naxis;
  naxisn = prof->naxisn;
  start = 0;
  fac = 1;
  for (n=0; n<naxis; n++)
    {
    val = *(posin++);
    width = *(naxisn++);
/*-- Get the integer part of the current coordinate or nearest neighbour */
    ival = (prof->interptype[n]==INTERP_NEARESTNEIGHBOUR)?
                                        (int)(val-0.50001):(int)val;
/*-- Store the fractional part of the current coordinate */
    dpos[n] = val - ival;
/*-- Check if interpolation start/end exceed image boundary... */
    kwidth = prof->kernelwidth[n];
    ival-=kwidth/2;
    if (ival<0 || ival+kwidth<=0 || ival+kwidth>width)
      return 0.0;

/*-- Update starting pointer */
    start += ival*fac;
/*-- Update step between interpolated regions */
    step[n] = fac*(width-kwidth);
    linecount[n] = 0.0;
    fac *= width;
    }

/* Update Interpolation kernel vectors */
  make_kernel(*dpos, kernel_vector, prof->interptype[0]);
  kwidth = prof->kernelwidth[0];
  nlines = prof->kernelnlines;
/* First step: interpolate along NAXIS1 from the data themselves */
  badpixflag = 0;
  pixin = prof->pix+start;