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Darren. No, each line is 1 pixel, which is mutiplied by 1.78 to give the graph scale in arc/secs, which is universal in assesing guide performance, because then "the numbers" apply to anyones set up.
2 arcsec P/P (although RMS is also important) for anything under 2m F/L imaging is fine IMO. Random bumps much higher than this are not good though, can make stars elongated, even though other imaged objects such as nebula are not affected as much.
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