diff --git a/ObservationSim/sim_steps/readout_output.py b/ObservationSim/sim_steps/readout_output.py
index 7e084b0d2658d6648f4db6cc905df93d3dde1d27..1702a01914c6ba953cee77c516ab43a909858623 100644
--- a/ObservationSim/sim_steps/readout_output.py
+++ b/ObservationSim/sim_steps/readout_output.py
@@ -13,7 +13,7 @@ def add_prescan_overscan(self, chip, filt, tel, pointing, catalog, obs_param):
                                     over1=chip.overscan_x,
                                     over2=chip.overscan_y)
 
-    if obs_param["poisson_and_dark"]["add_dark"] == True:
+    if obs_param["add_dark"] == True:
         ny = int(chip.npix_y/2)
         base_dark = (ny-1)*(chip.readout_time/ny)*chip.dark_noise
         chip.img.array[(chip.prescan_y+ny):-(chip.prescan_y+ny),:] = bese_dark
diff --git a/config/obs_config_SCI_WIDE_phot.yaml b/config/obs_config_SCI_WIDE_phot.yaml
index 89a2dc36ebe22f914b57310583abbe2519fce7f1..15ac19b0825c9cf1409418ce76b90ec9c2e83dc7 100644
--- a/config/obs_config_SCI_WIDE_phot.yaml
+++ b/config/obs_config_SCI_WIDE_phot.yaml
@@ -14,7 +14,8 @@ obs_type_code: "101"
 obs_id: "00000001" # this setting will only be used if pointing list file is not given
 
 # Define list of chips
-run_chips: [8]
+run_chips: [6,7,8,9,11,12,13,14,15,16,17,18,19,20,22,23,24,25]
+#run_chips: [1,2,3,4,5,10,21,26,27,28,29,30]
 
 # Define observation sequence
 call_sequence:
@@ -64,9 +65,10 @@ call_sequence:
   # Apply CCD Saturation & Blooming
   blooming: {}
   # # Run CTE simulation
-  CTE_effect: {}
+  ##CTE_effect: {}
   # Add prescan and overscan
-  prescan_overscan: {}
+  prescan_overscan:
+    add_dark: YES
   # Add bias
   bias:
     bias_16channel: YES
@@ -78,4 +80,4 @@ call_sequence:
   # Output the final image
   quantization_and_output:
     format_output: YES
-...
\ No newline at end of file
+...