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I'm a little confused, where did the 122 secs come from? It seems you have one peak at the 681sec spot and the next peak at the 1641 sec spot, that's a difference of 960 secs.
Plus I think you should include the DEC graph as well, because sometimes movement in DEC can exaggerate the movement in RA. Those big swings could be caused by something moving in DEC (flexure??).
Cheers
Bill
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