iraf.net

Hi Nigel,
Sorry for the slow response, I'm travelling at the moment.> Can you remind me what this means:
>
> imextn/imtype environment variables
>
> since I have often struggled to get environment variables
> to work reliably - they sometimes disappear - and so
> maybe I need to know this...The 'imextn' defines the list of file extensions that map to a particular
image kernel in the system. So for instance try a cl> show imextnto view the current setting and then to add say 'fts' as a valid FITS
extension one would: cl> reset imextn = "oif:imh fxf:fits,fit,fts plf:pl qpf:qp stf:hhh,??h"The file extension is what tells IRAF which image kernel to use on the
file.
The 'imtype' sets the default type of image to create when writing
a new image without specifying the extension explicitly. If you do add
the extension it will override the imtype value.
Hope this helps.Cheers,
-Mike