From running a test with the debug code enabled:
F1: plot of the input data (expTime vs Flux), with filtered points marked in red. The bottom panel shows the difference between the inputOrdinate and the linearOrdinate.
F2: The top panel shows the bincenters and values for the correction in the top panel. Bottom panel is useless due to choice of overloading one debug method.
F3: The top panel shows the relation between the linear flux (x-axis) and the input flux (y-axis). This is a less useful plot. The bottom panel shows the residual between the the input flux and the model correction.