github.com/astrogo/fitsio@v0.3.0/testdata/example.fits (about)
1 SIMPLE = T / primary HDU BITPIX = -64 / number of bits per data pixel NAXIS = 2 / number of data axes NAXIS1 = 3 / length of data axis 1 NAXIS2 = 4 / length of data axis 2 EXTNAME = 'primary hdu' / the primary HDU EXTVER = 2 / the primary hdu version END ?ð @ @ @ @ @ @ @ @" ?ð