[fitswcs] WCS with NAXIS=0

[Eric Greisen]

William Pence writes:
 > Eric Greisen wrote:
 > > 
 > > William Pence writes:
 > >  > Is the use of WCS keywords (like CRPIX1 and CRVAL1) now allowed in image
 > >  > HDUs which have NAXIS = 0?  This question has to do with whether our FITS
 > >  > verification program (fverify) should issue any warning or error message if
 > >  > this occurs.
 > >  >
 > > 
 > > That is what WCSAXES is all about.  See
 > >       http://www.aoc.nrao.edu/~egreisen
 > > for links to versions of Paper I and info about its volume and page
 > > numbers.
 > 
 > Should this be considered an error if there is no WCSAXES keyword?

Yes

Eric