Hi All, Recently I've been taking quite a few images with my STXL camera. I've been working on some guiding issues with my MEII and I decided to add in a series of ( 60 x 30 sec) main chip images; all in an effort to more closely match the imaging cycle. I've noticed there pops up an occasional image that has an overlay of vertical bars. Not sure what's causing this but I'm concerned that it will affect future images, ones I want to keep. I had to put a sample image in my Dropbox as it's pretty large. Here is the link: https://www.dropbox.com/s/4w4x3zrgdu6a79y/AO-X Autoguide Test Seq_19 10 16 -0017LUM.fit?dl=0 Any suggestions?