Hi Bob. Down the left hand side of DSS there's a 'settings' option. If you click that, then click 'stacking options' you'll get a multiple tab box open up. The second one is labeled 'comet' where you can either choose to stack based on the position of the comet, or the standard 'star' alignment. There's also an option to stack on both - don't know how that works - perhaps I'll go give it whirl and see what it does.
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