diff --git a/src/toolbox_scs/routines/boz.py b/src/toolbox_scs/routines/boz.py
index b07ac7f2251674cc5cd8266030cfbdf3351af809..bdfeb1e0d76c56491f6c679472211a8d1f5e7aca 100644
--- a/src/toolbox_scs/routines/boz.py
+++ b/src/toolbox_scs/routines/boz.py
@@ -68,7 +68,6 @@ class parameters():
         self.sat_level = None
         self.max_iter = None
 
-
         # temporary data
         self.arr_dark = None
         self.tid_dark = None
@@ -1403,7 +1402,7 @@ def inspect_correction(params, gain=None):
     # flat flat_field
     plane_ff = params.get_flat_field()
     if plane_ff is None:
-        plane_ff = [0.0, 0.0, 1.0, -1.0]
+        plane_ff = [0.0, 0.0, 1.0, -1.0, 0.0, 0.0, 1.0, -1.0]
     ff = compute_flat_field_correction(params.rois, plane_ff)
 
     # non linearities