[AstroPy] Reading FITS uncompressed headers performance

[Jiří Nádvorník]

Hi all,

I am a little confused about the performance of astropy.io.fits when trying
to open just the primary header of a compressed (.bz2) FITS file. The
header is uncompressed plain text, correctly ended by the END tag.

Is there some setting that I need to use to parse the header without
needing to decompress the whole file?

Thank you,

Jiri N.
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