This program will import fits (Flexible Image Transport System) image files into
ISIS format. FITS files with extensions are supported upto and including the first non-image
extension. Images follwing the first non-image extension can not be accessed
(i.e., NAXIS = 0 , implying extensions with data, are not supported). Some common header data
is transfered to the ISIS labels. Primary image data is transfered completely.
Use this parameter to select which image to extract from the FITS file. The primary image
is 0, the first image extension is 1, the second image extension is 2, and so on. NOTE:
Image extensions following any non-image extension can not be accessed.