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Hi Al.
I think you will find that if you were to accurately measure the change in position for each image the drift/time will be linear (or as close as over the imaging time to make little difference). It only looks curved due to the the change of frame time. ie time from frame 1 to 2 - 5 min, 2 to 3 - 2 min, 3 to 4 - 30 sec etc (these are only demonstration times to give you the picture/idea)
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