add gain value for closing 16 channel; fix sls bug: in two grating stitch

observation_sim/mock_objects/Galaxy.py

@@ -375,7 +375,7 @@ class Galaxy(MockObject):
                        1, origin_star[1] + galImg.array.shape[1] - 1]
 
             if gal_origin[1] < grating_split_pos_chip < gal_end[1]:
-                subSlitPos = int(grating_split_pos_chip - gal_origin[1] + 1)
+                subSlitPos = int(grating_split_pos_chip - gal_origin[1])
                 # part img disperse
 
                 star_p1s=[]
@@ -407,12 +407,12 @@ class Galaxy(MockObject):
                 for galImg in galImg_List:
 
                     subImg_p2 = galImg.array[:,
-                                          subSlitPos + 1:galImg.array.shape[1]]
+                                          subSlitPos:galImg.array.shape[1]]
                     star_p2 = galsim.Image(subImg_p2)
                     star_p2.setOrigin(0, 0)
                     star_p2s.append(star_p2)
                 origin_p2 = [origin_star[0], grating_split_pos_chip]
-                xcenter_p2 = max(x_nominal, grating_split_pos_chip - 1) - 0
+                xcenter_p2 = max(x_nominal, grating_split_pos_chip) - 0
                 ycenter_p2 = y_nominal - 0
 
                 sdp_p2 = SpecDisperser(orig_img=star_p2s, xcenter=xcenter_p2,

observation_sim/sim_steps/readout_output.py

@@ -44,6 +44,7 @@ def apply_gain(self, chip, filt, tel, pointing, catalog, obs_param):
                                                                     seed=self.overall_config["random_seeds"]["seed_gainNonUniform"]+chip.chipID)
     elif obs_param["gain_16channel"] == False:
         chip.img /= chip.gain
+        chip.gain_channel = np.ones(chip.nsecy*chip.nsecx)*chip.gain
     return chip, filt, tel, pointing