[pvelez (Pete)]

You know Graeme, I scannedthat site but couldn't locate the discussion of Ha combination - it was lurking in the text as the heading was tacked on to the discussion of M42. Thanks for pointing it out - I found it this time. I'll give it a go this evening

Pete

Originally Posted by Rigel003

You could try this from Russel Croman's website.

http://www.rc-astro.com/resources/index.html