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I dunno, my experience with measuring PE on Paramount ME (mind you not an ME II) is that whenever I measured raw peak to peak PE as sub-arcsecond, I was doing it wrong and just measuring noise instead of signal, so to speak. So I'm a bit suspicious of your measuring your raw peak to peak PE as sub-arcsecond. Corrected by PEC peak to peak PE should always be sub-arcsecond, of course.
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