Thanks again.
I have actually made improvements to this image today, as this area (particularly the middle of each nebula) is supposed to have a lot of blue reflection nebulosity from the embedded star clusters.
So, I went back to look at the blue data, and sure enough, it was there alright, so these new versions (half and full size) show that.
Half-Size
http://tinyurl.com/38t56ec
Full-Size (15Mb)
http://tinyurl.com/379jf7h
cheers
Martin