diff --git a/ObservationSim/Config/Header/ImageHeader.py b/ObservationSim/Config/Header/ImageHeader.py
index 3566a8da7be92c744ee83794b98efcc809c818d3..1de7dc98e01c5354dc7d24d935dd042cbb33b1f2 100644
--- a/ObservationSim/Config/Header/ImageHeader.py
+++ b/ObservationSim/Config/Header/ImageHeader.py
@@ -419,7 +419,10 @@ def generatePrimaryHeader(xlen = 9216, ylen = 9232, pointing_id = '00000001', po
 
     ra_hms = format(co.ra.hms.h, '02.0f') + format(co.ra.hms.m, '02.0f') + format(co.ra.hms.s, '02.1f')
     dec_hms = format(co.dec.dms.d, '02.0f') + format(abs(co.dec.dms.m), '02.0f') + format(abs(co.dec.dms.s), '02.0f')
-    h_prim['TARGET'] = ra_hms + '+' + dec_hms
+    if dec > 0:
+        h_prim['TARGET'] = ra_hms + '+' + dec_hms
+    else:
+        h_prim['TARGET'] = ra_hms + dec_hms
     #
     # h_prim['RA_NOM'] = ra_hms
     # h_prim['DEC_NOM'] = dec_hms
diff --git a/ObservationSim/MockObject/FlatLED.py b/ObservationSim/MockObject/FlatLED.py
index 8c517cda98e9c0eea51f5fddf130b810fabc5dcf..37fbf6dfda12e5ade2e104a772299d1c0948ed1e 100755
--- a/ObservationSim/MockObject/FlatLED.py
+++ b/ObservationSim/MockObject/FlatLED.py
@@ -106,6 +106,11 @@ class FlatLED(object):
             return np.ones([self.chip.npix_y,self.chip.npix_x])
 
         ledFlat = np.zeros([self.chip.npix_y,self.chip.npix_x])
+
+        ledStat = '00000000000000'
+        ledTimes = [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
+
+        nledStat = '2'
         for i in np.arange(len(led_type_list)):
             led_type = led_type_list[i]
             exp_t = exp_t_list[i]
@@ -126,7 +131,10 @@ class FlatLED(object):
             unitFlatImg = unitFlatImg * t_spec
             # print("DEBUG1:---------------",np.mean(unitFlatImg))
             ledFlat = ledFlat+unitFlatImg*exp_t
-        return ledFlat
+
+            ledStat = ledStat[0:int(led_type[3:])-1]+nledStat+ledStat[int(led_type[3:]):]
+            ledTimes[int(led_type[3:])-1] = exp_t * 1000
+        return ledFlat, ledStat, ledTimes
 
     def drawObj_LEDFlat_slitless(self, led_type_list=['LED1'], exp_t_list=[0.1]):
         if len(led_type_list) != len(exp_t_list):
@@ -154,8 +162,9 @@ class FlatLED(object):
                 flat_cube=self.chip.flat_cube, led_spec=led_spec)
 
             ledFlat = ledFlat + ledspec_map
-
-        return ledFlat
+            ledStat = ledStat[0:int(led_type[3:])-1]+nledStat+ledStat[int(led_type[3:]):]
+            ledTimes[int(led_type[3:])-1] = exp_t * 1000
+        return ledFlat, ledStat, ledTimes
 
     def drawObj_LEDFlat(self, led_type_list=['LED1'], exp_t_list=[0.1]):
         if self.chip.survey_type == "photometric":
diff --git a/ObservationSim/sim_steps/add_LED_flat.py b/ObservationSim/sim_steps/add_LED_flat.py
index eaeda9b49ec934e5cad143eb53ae193dc6080e57..bacfab4b9b4617bea33d5d335f46329dd4c75bda 100644
--- a/ObservationSim/sim_steps/add_LED_flat.py
+++ b/ObservationSim/sim_steps/add_LED_flat.py
@@ -13,8 +13,10 @@ def add_LED_Flat(self, chip, filt, tel, pointing, catalog, obs_param):
             print("LED OPEN--------")
 
             led_obj = FlatLED(chip, filt)
-            led_flat = led_obj.drawObj_LEDFlat(led_type_list=obs_param["LED_TYPE"], exp_t_list=obs_param["LED_TIME"])
+            led_flat, ledstat, letts = led_obj.drawObj_LEDFlat(led_type_list=obs_param["LED_TYPE"], exp_t_list=obs_param["LED_TIME"])
             pf_map = led_flat
+            self.updateHeaderInfo(header_flag='ext', keys = ['LEDSTAT'], values = [ledstat])
+            self.updateHeaderInfo(header_flag='ext', keys = ['LEDT01','LEDT02','LEDT03','LEDT04','LEDT05','LEDT06','LEDT07','LEDT08','LEDT09','LEDT10','LEDT11','LEDT12','LEDT13','LEDT14'], values = letts)
 
     if obs_param["shutter_effect"] == True:
         pf_map = pf_map * chip.shutter_img
diff --git a/config/obs_config_Calibration_BIAS.yaml b/config/obs_config_Calibration_BIAS.yaml
index ae4f164cc4ef7ce7dc6013ebda4053592c8b8ed7..384c74415a331ef168e76ac198783a65af3119c6 100644
--- a/config/obs_config_Calibration_BIAS.yaml
+++ b/config/obs_config_Calibration_BIAS.yaml
@@ -61,7 +61,8 @@ call_sequence:
   # # Run CTE simulation
   CTE_effect: {}
   # Add prescan and overscan
-  prescan_overscan: {}
+  prescan_overscan: 
+    add_dark: YES
   # Add bias
   bias:
     bias_16channel: YES
@@ -72,5 +73,5 @@ call_sequence:
     gain_16channel: YES
   # Output the final image
   quantization_and_output:
-    format_output: NO
+    format_output: YES
 ...
\ No newline at end of file
diff --git a/config/obs_config_Calibration_FLAT.yaml b/config/obs_config_Calibration_FLAT.yaml
index 54e9465782f5e62d41cbac13405968eddabc4e7e..e5546276ab5d052263ffedd1745174e627b417e9 100644
--- a/config/obs_config_Calibration_FLAT.yaml
+++ b/config/obs_config_Calibration_FLAT.yaml
@@ -61,7 +61,8 @@ call_sequence:
   # # Run CTE simulation
   CTE_effect: {}
   # Add prescan and overscan
-  prescan_overscan: {}
+  prescan_overscan: 
+    add_dark: YES
   # Add bias
   bias:
     bias_16channel: YES
@@ -72,5 +73,5 @@ call_sequence:
     gain_16channel: YES
   # Output the final image
   quantization_and_output:
-    format_output: NO
+    format_output: YES
 ...
\ No newline at end of file