Which HFR reading is graphed in autofocus?

Since there are multiple stars’ HFRs showing in the autofocus frame, which one is plotted in the graph? The reason I ask is that often the graph shows a plot that is below the next one in the V-curve. This doesn’t make sense to me as the image looks sharper in the next image in the autofocus sequence. Thanks. Rick

No particular star… the mean

Ok, makes total sense. But then why does the first plot sometimes appear below the next plot in the V-curve? Thanks. Rick

There are too many factors for me to answer that for you. We would need an AFPack to look at. Sometimes AF curves have “wings” when you have secondary obstruction. It also happens sometimes when you have motor backlash for which you are not compensating.