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I've been using PI Preprocessing elsewhere, however I'm new to it and I haven't been able to get either my helix nor my corona australis pictures to work in PI using batch pre-processing due to a lack of stars when stacking. PI throws an error
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You could try using the standalone StarAlignment module and reduce the number of stars required by changing the Star Detection or Star Matching setting - I don't have PI in front of me right now. Look for the default 2000. Reduce it to 200 or less.