The progress of our iterative method is shown in two aspects. Left panel: number of stars flagged as “overluminous” and removed at each iteration. Right panel: absolute error in the predicted absolute magnitude after each iteration. The error for each iteration’s test sample is shown in black, and the error for the full sample (including the overluminous systems) is shown in orange. We can see that there are progressive gains, but with diminishing returns. We note the elbow in the total sample’s error, where we identify that each iteration is no longer removing binaries. We mark the 40th iteration as the breaking point by eye and use this as our terminal model.