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Author: Kacper Kowalik <xarthisius.kk@gmail.com>
Description: Copy keys to a list, since orignal map is modified
Url: https://github.com/astropy/astropy/issues/4477
Bug: https://github.com/astropy/astropy/issues/4460
--- a/astropy/wcs/wcs.py
+++ b/astropy/wcs/wcs.py
@@ -988,7 +988,7 @@
"""
# Never pass SIP coefficients to wcslib
# CTYPE must be passed with -SIP to wcslib
- for key in (m.group() for m in map(SIP_KW.match, header.keys())
+ for key in (m.group() for m in map(SIP_KW.match, list(header))
if m is not None):
del header[key]
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