What is the Y-axis in "1D search over varying defocus values" in CTF Estimation

This is the plot of “1D search over varying defocus values”. I know that the x axis is Defocus values (A) but how do we label Y axis of this plot?

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It appears to be some sort of correlation, because the peak usually matches the estimated defocus below it.


@wtempel , could you please help answer this?

Correct. I checked with our team: the y-axis a normalized correlation between simulated and experimental Thon rings, with the peak at the estimated defocus.