Martin,
Once it's understood it makes things easier.....
Another point: To determine the quality rating of the individual frames, the "Global setting" just picks the "best" whole frame image and sorts them..
Using the Alignment points (ie when imaging the solar disk) it looks at each individual "cell" within the frame ( the 24/ 48 pixel etc.) and sorts the cells into best to worse then recreates the final image based on these cells.
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