fits

What does it mean that a card is fixed to meet FITS standard?

What does it mean that a card is fixed to meet FITS standard? Question: I am trying to use a FITS file. I have the following code: from astropy.io import fits from astropy.wcs import WCS hdul = fits.open(fitsfilename)[0] wcs = WCS(hdul.header) It gives me these warnings: WARNING: VerifyWarning: Verification reported errors: [astropy.io.fits.verify] WARNING: VerifyWarning: Card …

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