FitsHeader - a Yorick structure defined to store (part of) FITS
header information. The structure has the following members:
bitpix - bits-per-pixel: 8 pixel values are unsigned bytes
16 pixel values are signed 2-byte integers
32 pixel values are signed 4-byte integers
-32 pixel values are 4-byte floating points
-64 pixel values are 8-byte floating points
naxis - number of axis
axis(k) - number of pixel along k-th axis
bscale - pixelValue = BZERO+BSCALE*fileValue
bzero - pixelValue = BZERO+BSCALE*fileValue
bunit - brightness unit
datamax - maximum data value in the file
datamin - minimum data value in the file
object - image name
date - date of file creation (dd/mm/yy)
date_obs - date of data acquisition (dd/mm/yy)
origin - institution
instrume - data acquisition instrument
telescop - data acquisition telescope
observer - observer name/identification
history - newline separated history lines
comment - newline separated comment lines
epoch - epoch of coordinate system (year)
crval(k) - coord = CRVAL+(pixel-CRPIX)*CDELT
crpix(k) - coord = CRVAL+(pixel-CRPIX)*CDELT
cdelt(k) - coord = CRVAL+(pixel-CRPIX)*CDELT
ctype(k) - type of physical coordinate
crota(k) - rotation angle of axis No. #
keyword, defined at i/fits.i line 2982
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