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# L1-MBI Data model
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## File: \*\_*_L1_1.fits
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### File contents
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| HDU   | data                    | note        |
|-------|-------------------------|-------------|
| HDU0  | None                    | PrimaryHDU  |
| HDU1  | reduced SCI (9k x 9k)   | ImageHDU    |
| HDU2  | reduced ERR (9k x 9k)   | ImageHDU    |
| HDU3  | reduced DQ (9k x 9k)    | ImageHDU    |

### *HDU0 --> HDU1

| keyword            | value                  | comment                                      | fallback_value        | type   | module                  |
|--------------------|:-----------------------|----------------------------------------------|-----------------------|--------|-------------------------|
| SIMPLE             | T                      | Fits standard                                | T                     | bool   | csst_ms_sls_instrument  |
| BITPIX             | 8                      | array data value                             | 8                     | i8     | csst_ms_sls_instrument  |            
| NAXIS              | 0                      | Number of axes                               | 0                     | i8     | csst_ms_sls_instrument  |             
| EXTEND             | T                      | file may contain standard extensions         | T                     | bool   | csst_ms_sls_instrument  |             
| NEXTEND            | 3                      | Number of file extensions                    | 3                     | i8     | csst_ms_sls_instrument  |
| *VER_CRDS          | '0.0.1 '               | Version of CRDS file selection software used | '0.0.1 '              | str    | csst_ms_sls_instrument  |
| R_GAIN             | '*.gain.fits'          | Gain reference file name                     | 'N/A'                 | str    | csst_ms_sls_instrument  |
| R_READN            | '*.rn.fits'            | Read noise reference file name               | 'N/A'                 | str    | csst_ms_sls_instrument  |
| R_SATURA           | '*.sat.fits'           | Saturation reference file name               | 'N/A'                 | str    | csst_ms_sls_instrument  |
| R_MASK             | '*.msk.fits'           | Mask reference file name                     | 'N/A'                 | str    | csst_ms_sls_instrument  |
| R_BIAS             | '*bias.fits'           | SuperBias reference file name                | 'N/A'                 | str    | csst_ms_sls_instrument  |
| R_DARK             | '*dark.fits'           | Dark reference file name                     | 'N/A'                 | str    | csst_ms_sls_instrument  |
| R_DFLAT            | '*flat.fits'           | Detector Flat reference file name            | 'N/A'                 | str    | csst_ms_sls_instrument  |
| R_SFLAT            | '*flat.fits'           | Spectrograph Flat reference file name        | 'N/A'                 | str    | csst_ms_sls_instrument  |
| S_DQINI            | T                      | Data Quality Initialization                  | F                     | bool   | csst_ms_sls_instrument  |
| S_SATURA           | T                      | Saturation Checking                          | F                     | bool   | csst_ms_sls_instrument  |
| S_ERRINI           | T                      | Error Initialization                         | F                     | bool   | csst_ms_sls_instrument  |
| S_BIAS             | T                      | Bias correction                              | F                     | bool   | csst_ms_sls_instrument  |
| S_DARK             | T                      | Dark correction                              | F                     | bool   | csst_ms_sls_instrument  |
| S_FLAT             | T                      | Flat field correction                        | F                     | bool   | csst_ms_sls_instrument  |
| *VER_INST DCP_VER  | '0.0.1 '               | detector-level calibration pipeline version  | '0.0.1 '              | str    | csst_ms_sls_instrument  |
| *STM_INST DCP_TIME | '2022-12-30T10:18:53'  | pipeline processing time                     | '2022-12-30T10:18:53' | str    | csst_ms_sls_instrument  |
| HISTORY            | '**step complete.'     | record processing message                    | 'null'                | str    | csst_ms_sls_instrument  |
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### HDU1

#### Header of `csst_ms_sls_instrument`
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| keyword   | value    | comment                                   | fallback_value | type  | module                   |
|-----------|:---------|-------------------------------------------|----------------|-------|--------------------------|
| EXTNAME   | SCI      | extension name                            | SCI            | str   | csst_ms_sls_instrument   |
| EXTVER    | 1        | extension version number                  | 1              | i8    | csst_ms_sls_instrument   |
| BUNIT     | *e-/s    | brightness units                          | *e-/s          | str   | csst_ms_sls_instrument   |
| *NGOODPIX | 84794368 | number of good pixels                     | 0              | f32   | csst_ms_sls_instrument   |
| SDQFLAGS  | 31743    | serious data quality flags                | 0              | i16   | csst_ms_sls_instrument   |
| *GOODMAX  | 260.0    | maxmum value of good pixels               | 0              | f32   | csst_ms_sls_instrument   |
| GOODMIN   | -0.001   | minmum value of good pixels               | 0              | f32   | csst_ms_sls_instrument   |
| GOODMEAN  | 0.3      | mean value of good pixels                 | 0              | f32   | csst_ms_sls_instrument   |
| SNRMIN    | 187.4    | minmum signal to noise of good pixels     | 0              | f32   | csst_ms_sls_instrument   |
| SNRMAX    | 1.2      | maxmum signal to noise of good pixels     | 0              | f32   | csst_ms_sls_instrument   |
| SNRMEAN   | 3.38     | average of the dark values subtracted     | 0              | f32   | csst_ms_sls_instrument   |

VER_INST
STA_INST
STM_INST
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#### Header of `csst_ms_sls_position`
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| keyword          | value                 | comment                      | fallback_value | type   | module                |
|------------------|:----------------------|------------------------------|----------------|--------|-----------------------|
| CTYPE1           | 'RA---TPV'            |                              | 'RA---TPV'     | str    | csst_ms_sls_position  |
| CTYPE2           | 'DEC--TPV'            |                              | 'DEC--TPV'     | str    | csst_ms_sls_position  |
| CUNIT1           | 'deg  '               |                              | 'deg'          | str    | csst_ms_sls_position  |
| CUNIT2           | 'deg  '               |                              | 'deg'          | str    | csst_ms_sls_position  |
| RADESYS          | 'ICRS '               |                              | 'ICRS'         | str    | csst_ms_sls_position  |
| PV1_0            | 0.003205383944913964  |                              | 0              | f32    | csst_ms_sls_position  |
| PV1_1            | 0.8673020820536499    |                              | 0              | f32    | csst_ms_sls_position  |
| PV1_2            | -0.2011989871377834   |                              | 0              | f32    | csst_ms_sls_position  |
| PV1_3            | -0.2597214229472611   |                              | 0              | f32    | csst_ms_sls_position  |
| PV1_4            | 0.4353828741811097    |                              | 0              | f32    | csst_ms_sls_position  |
| PV1_5            | -0.5054216569802673   |                              | 0              | f32    | csst_ms_sls_position  |
| PV1_6            | 0.1951474426617432    |                              | 0              | f32    | csst_ms_sls_position  |
| PV2_0            | 0.00109803885992697   |                              | 0              | f32    | csst_ms_sls_position  |
| PV2_1            | 0.9171065857705857    |                              | 0              | f32    | csst_ms_sls_position  |
| PV2_2            | -0.04908256792722099  |                              | 0              | f32    | csst_ms_sls_position  |
| PV2_3            | -0.09860562038448289  |                              | 0              | f32    | csst_ms_sls_position  |
| PV2_4            | 0.07961855240788976   |                              | 0              | f32    | csst_ms_sls_position  |
| PV2_5            | -0.2009224365497067   |                              | 0              | f32    | csst_ms_sls_position  |
| PV2_6            | 0.1741954691884874    |                              | 0              | f32    | csst_ms_sls_position  |
| *NS_POS STAR_FIT | 10                    | number of the stars          | 0              | i8     | csst_ms_sls_position  |
| RA_OFF           | -0.0                  | mas in unit                  | -99            | f32    | csst_ms_sls_position  |
| DEC_OFF          | 0.0                   | mas in unit                  | -99            | f32    | csst_ms_sls_position  |
| RA_RMS           | 127.1                 | mas in unit                  | -99            | f32    | csst_ms_sls_position  |
| DEC_RMS          | 60.4                  | mas in unit                  | -99            | f32    | csst_ms_sls_position  |
| RA_CEN           | 193.299027            | center of detector in ra     | 0              | f32    | csst_ms_sls_position  |
| DEC_CEN          | 26.08851              | center of detector in dec    | 0              | f32    | csst_ms_sls_position  |
| *VER_POS         | '1.0'                 | version of distortion        | '1.0'          | str    | csst_ms_sls_position  |
| *STM_POS         | '2023-02-16 12:15:16' | time of last modification    |                | str    | csst_ms_sls_position  |
| *STA_POS         | 0                     | 0 for done, 1 for failure    | 1              | i8     |  csst_ms_sls_position |
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#### Header of `csst_ms_sls_qc1`
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| keyword        | value    | comment                      | fallback_value | type  | module          |
|----------------|:---------|------------------------------|----------------|-------|-----------------|
| *STA_QC1 QC1_S | 0        | 0 for success, 1 for failure | 1              | i8    | csst_ms_sls_qc1 |
| VER_QC1        | '0.0.1'  | QC1 pipeline version         | '0.0.1'        | str   | csst_ms_sls_qc1 |
| QC1_FLAG       | 0        | quality flags                | -99            | i16   | csst_ms_sls_qc1 |
+ STM_QC1
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### HDU2

#### Header of `csst_ms_sls_instrument`
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| keyword  | value         | comment                    | fallback_value | type    | module                  |
|----------|---------------|----------------------------|----------------|---------|-------------------------|
| XTENSION | IMAGE         | Image extension            | IAMGE          | str     | csst_ms_sls_instrument  |
| BITPIX   | -32           | bits per data value        | -32            | i8      | csst_ms_sls_instrument  |                 
| NAXIS    | 2             | Number of array dimensions | 2              | i8      | csst_ms_sls_instrument  |                 
| NAXIS1   | 9216          | Size of the axis           | 9216           | i8      | csst_ms_sls_instrument  |                 
| NAXIS2   | 9232          | Size of the axis           | 9232           | i8      | csst_ms_sls_instrument  |
| PCOUNT   | 0             | number of parameters       | 0              | i8      | csst_ms_sls_instrument  |                         
| GCOUNT   | 1             | number of groups           | 1              | i8      | csst_ms_sls_instrument  |                                       
| EXTNAME  | ERR           | extension name             | ERR            | str     | csst_ms_sls_instrument  |
| EXTVER   | 1             | extension version number   | 1              | i8      | csst_ms_sls_instrument  |
| *BUNIT   | electrons/s   | brightness units           | electrons/s    | str     | csst_ms_sls_instrument  |
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### HDU3

#### Header of `csst_ms_sls_instrument`
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| keyword   | value       | comment                    | fallback_value | type   | module                 |
|-----------|-------------|----------------------------|----------------|--------|------------------------|
| XTENSION  | IMAGE       | Image extension            | IAMGE          | str    | csst_ms_sls_instrument |
| BITPIX    | 16          | bits per data value        | 16             | i8     | csst_ms_sls_instrument |                 
| NAXIS     | 2           | Number of array dimensions | 2              | i8     | csst_ms_sls_instrument |                 
| NAXIS1    | 9216        | Size of the axis           | 9216           | i8     | csst_ms_sls_instrument |                 
| NAXIS2    | 9232        | Size of the axis           | 9232           | i8     | csst_ms_sls_instrument |
| PCOUNT    | 0           | number of parameters       | 0              | i8     | csst_ms_sls_instrument |                         
| GCOUNT    | 1           | number of groups           | 1              | i8     | csst_ms_sls_instrument |
| EXTNAME   | DQ          | extension name             | DQ             | str    | csst_ms_sls_instrument |
| EXTVER    | 1           | extension version number   | 1              | i8     | csst_ms_sls_instrument |
| *BUNIT    | unitless    | brightness units           | unitless       | str    | csst_ms_sls_instrument |
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