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Thanks Robin.
The pointer helps, trying to make reference chart for the next time.
Yes I see that the order is important, I was thinking how a star could have no blue section?
I used Sirius to focus my set up before going to the comet and Eta Carina. I'll chose a less bright one next time. I did concentrate on getting the spectra horizontal and as narrow a line. Perhaps a little less exposure will help with a few more frames to make a medium image. And then again, read the manual...8)
kind regards, Alan
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