On 08/13/2014 11:34 AM, gonghang.naoc wrote: > Sorry. I am NOT sure a single pyraf without iraf can work, although > there is something here. If you want to run IRAF tasks, you need IRAF. If you install both IRAF and PyRAF, you'll be able to run IRAF tasks either via the IRAF cl or via PyRAF. Phil