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-rw-r--r--updatewcs/det2im.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/updatewcs/det2im.py b/updatewcs/det2im.py
index 0aa8f2a..0d87134 100644
--- a/updatewcs/det2im.py
+++ b/updatewcs/det2im.py
@@ -14,7 +14,7 @@ class DET2IMCorr(object):
Uses a kw 'D2IMFILE' in the primary header to create an extension with
a detector to image correction.
"""
- assert isinstance(fobj, pyfits.NP_pyfits.HDUList)
+ assert isinstance(fobj, pyfits.HDUList)
d2imfile = fileutil.osfn(fobj[0].header['D2IMFILE'])
axiscorr = cls.getAxisCorr(d2imfile)