The minimum of the global fit. For our standard conditions (7 × 5 × 16 = 560 data points), fits with only 22 parameters were carried out while fixing the 23rd parameter and varying it by the factor B in the proximity of the true value as obtained by the 23-parameter fit. B was varied from 1/8 to 8 in logarithmically equidistant steps. The MSE was normalized to the true MSE_true value of the respective parameter. (A–C) Plots of the indicated fit parameters. There are robust minima of MSE/MSE_true for all parameters apart from the anticorrelated parameters E4 and Z₁₅, for which much flatter minima were found.