An update from DM-25450 relevant to this ticket is that a new Rho0 statistic has been defined as the two-point correlation function of PSF size residuals. Attached is a plot for one tract.

Thank you for cleaning this up, it's looking much better.

The filled points are positive in sign, and empty are negative. We are interested in the magnitude of the rho-statistics and the sign of the points are only secondary. So have the y-axis in symlog scale isn't particularly helpful.

What is the difference between the filled and empty symbols?

The plots from the most recent version of the branch is attached here. For the sake of clarity, the different Rho statistics are plotted to two different files, instead of two panels in one figure.