iraf.net

Hi all,I'm trying to perform photometry on frames with a variable PSF.
I found this on' A User's Guide to Stellar CCD Photometry with IRAF' by Massey & Davis:The worst thing to find at this point is that there is a systematic pattern with position on the chip. This would indicate that the PSF is variable. There is the [b:8b1785fca3]option for making a variable PSF[/b:8b1785fca3], but the assumption is that the PSF varies smoothly in x and y; usually this is not the case. (In the case of the non­flat TI chips the variations are due to the potato­chip like shape.) If you do decide the PSF is variable, be sure to use plenty of stars in making the PSF. As it says in the "help page'', twenty-five to thirty is then not an unreasonable number. If that doesn't scare you off, nothing will. Now, I can't find the variable PSF option anywhere. Could somebody point me in the right direction?One more thing, where can I get this article?:http://adsabs.harvard.edu/abs/1994awca.conf...72S(Title: Photometry with a Variable PSF; Authors: Stetson, P. B.)Thanks!Gabriel

I've found that option: 'daopars.variable'.If anybody has access to the article though, I'd really appreciate if you could let me know where I can get it.Cheers!
Gaba