move CTE effect before adding bias

ObservationSim/Instrument/Chip/Chip.py

@@ -515,21 +515,6 @@ class Chip(FocalPlane):
         if config["ins_effects"]["add_badcolumns"] == True:
             img = effects.BadColumns(img, seed=SeedBadColumns, chipid=self.chipID, logger=self.logger)
 
-        # Add Bias level
-        if config["ins_effects"]["add_bias"] == True:
-            if self.logger is not None:
-                self.logger.info("  Adding Bias level and 16-channel non-uniformity")
-            else:
-                print("  Adding Bias level and 16-channel non-uniformity")
-            if config["ins_effects"]["bias_16channel"] == True:
-                img = effects.AddBiasNonUniform16(img, 
-                    bias_level=float(self.bias_level), 
-                    nsecy = 2, nsecx=8, 
-                    seed=SeedBiasNonuni+self.chipID,
-                    logger=self.logger)
-            elif config["ins_effects"]["bias_16channel"] == False:
-                img += self.bias_level
-
         # Apply Nonlinearity on the chip image
         if config["ins_effects"]["non_linear"] == True:
             if self.logger is not None:
@@ -553,6 +538,21 @@ class Chip(FocalPlane):
             else:
                 print("  Apply CTE Effect")
             img = effects.CTE_Effect(GSImage=img, threshold=27)
+        
+        # Add Bias level
+        if config["ins_effects"]["add_bias"] == True:
+            if self.logger is not None:
+                self.logger.info("  Adding Bias level and 16-channel non-uniformity")
+            else:
+                print("  Adding Bias level and 16-channel non-uniformity")
+            if config["ins_effects"]["bias_16channel"] == True:
+                img = effects.AddBiasNonUniform16(img, 
+                    bias_level=float(self.bias_level), 
+                    nsecy = 2, nsecx=8, 
+                    seed=SeedBiasNonuni+self.chipID,
+                    logger=self.logger)
+            elif config["ins_effects"]["bias_16channel"] == False:
+                img += self.bias_level
 
         # Add Read-out Noise
         if config["ins_effects"]["add_readout"] == True: