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Not sure what you mean. PHD2 works like Pempro but less sophisticated. It projects a trend line when the star is at a certain location and you adjust until the trend line settles down to be accurate and it is level. That can be tricky in that you have to wait a while after an adjustment until the plot settles down and the trendline is obvious. It seems quite sensitive to small changes so that is good.
Pempro does something very similar but it has a few additional steps.
Greg.
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