Thanks Ken,
SW Western Australia had an extensive area of thunderstorms last night, in consequence we were without power fro 430am to 1345 pm. I used a large part of that time to read the AA7 user guide which I had printed , I reached the page of your attachment before my head started to spin. But several more reads should sort that out.
It would be nice if I could use AA7 for capture, pwhite nalance preprocessing and stacking and then finish processing, Perhaps in due time.
I am a little pleased with my original attachment as it shows the trapezium without resort to layers and masks, just be nice to do it all in one program.
Chris
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