THe horizontal lines are what is called banding pattern and it is inherent in all sensors and is only visible if you stretch very dim images to the limit. I only had one of each 16 min exposure so the banding pattern is not averaged out.
Here is an image done the same way from earlier data. Thread here
http://www.iceinspace.com.au/forum/s...ad.php?t=18641
Image 3.0MB
http://members.optusnet.com.au/~trlee8/LT_L.jpg
I think this is a vast improvement.
Bert