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-rw-r--r--lib/stwcs/updatewcs/wfpc2_dgeo.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/stwcs/updatewcs/wfpc2_dgeo.py b/lib/stwcs/updatewcs/wfpc2_dgeo.py
index d2d03ef..884bd7e 100644
--- a/lib/stwcs/updatewcs/wfpc2_dgeo.py
+++ b/lib/stwcs/updatewcs/wfpc2_dgeo.py
@@ -52,7 +52,8 @@ def update_wfpc2_d2geofile(filename, fhdu=None):
else:
d2imfile = None
fhdu['PRIMARY'].header['DGEOFILE'] = 'N/A'
- fhdu['PRIMARY'].header['D2IMFILE'] = 'N/A'
+ if 'D2IMFILE' not in fhdu['PRIMARY'].header:
+ fhdu['PRIMARY'].header['D2IMFILE'] = 'N/A'
# Only close the file handle if opened in this function
if close_fhdu: