For doubleSLAM, I want to be more systematic. For each observing night, I want to choose one well-defined "path" across the picture, moving the Seestar S50 so as to shift by about half a frame to the left, or right, each tile. Then first stack the tiles separately, and then make a 4/

mosaic of the path (which, due to sky rotation, will be somewhat curved). Final step: Make the final mosaic by combining those longish paths. That should cut down on calculation time, and make sure I don't have gaps. 5/