header : str or astropy.io.fits header object.
relax : bool or int, optional
Degree of permissiveness:
- True (default): Admit all recognized informal extensions of the
WCS standard.
- False: Recognize only FITS keywords defined by the
published WCS standard.
- int: a bit field selecting specific extensions to accept.
See Header-reading relaxation constants for details.
keysel : sequence of flags, optional
A list of flags used to select the keyword types considered by
wcslib. When None, only the standard image header
keywords are considered (and the underlying wcspih() C
function is called). To use binary table image array or pixel
list keywords, keysel must be set.
Each element in the list should be one of the following strings:
- ‘image’: Image header keywords
- ‘binary’: Binary table image array keywords
- ‘pixel’: Pixel list keywords
Keywords such as EQUIna or RFRQna that are common to
binary table image arrays and pixel lists (including
WCSNna and TWCSna) are selected by both ‘binary’ and
‘pixel’.
fix : bool, optional
When True (default), call fix on
the resulting objects to fix any non-standard uses in the
header. FITSFixedWarning warnings will be emitted if any
changes were made.
translate_units : str, optional
Specify which potentially unsafe translations of non-standard
unit strings to perform. By default, performs none. See
WCS.fix for more information about this parameter. Only
effective when fix is True.
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