What equipement did you use? How many lights and darks?
I am very interested in that, because I did my first pic of this region some weeks ago.
http://www.prokyon.startime.at/Bilder/M4.jpg
350d mod. with Canon 200 EF, ISO 800 2x300s
This was just a test, I will try it again. But I`m still waiting for better weather....
Maybe we can help each other with tips and experiences.