Glenn:

Thanks for the compliment re M3.

I hadn't noticed the green artifacts until you mentioned it. Thanks--I
removed them in PS 7 using the Healing Brush. I took darks right before
imaging, so the only explanation I have is the very warm temperature that
night. Unfortunately, I don't have a cooler, but I'm not sure that would
have helped. Some of the more knowledgeable members of the group might be
able to explain though.

Bob McDuell