wcsgrid - Extract FITS WCS keywords and plot graticule
wcsgrid [-a<alt>] [-d<pgdev>]
wcsgrid extracts the WCS keywords for an image from the specified FITS file and
uses pgsbox() to plot a 2-D coordinate graticule for each alternate
The FITS file may be specified according to the syntax understood
by cfitsio, for example "file.fits.gz+1" refers to the first
extension of a gzip'd FITS file. Use "-" or omit the file name for
input from stdin.
- Plot a graticule only for the alternate representation specified (ignored
if there is only one).
- PGPLOT device type (default XWINDOW, use "?" for list).
- Move to HDU number (1-relative) which is expected to contain an image
array. (Useful for input from stdin.)