header - display the ximage header

  header[/qualifiers]

List out the header of the current image. This includes:

                 instrument
                 image title
                 exposure time
                 coordinates of image centre
                 roll angle
                 image size in pixels
                 rebin factor
                 pixel size in arcsecs
                 min and max of image

header/exposure

List out the header of the exposure map associated with the current image.