Comparison of fit parameters with different SU vectors and stochastically varied elements. Same formalism as in Figs. 7 and 11. In the bar graphs, the fitted parameters, x_i, are compared with the true parameters, x_i,tr (gray). Means and standard deviations of these fits are shown. The mean relative standard deviations σ_i,rel of 1,000 fits, ipr_i,1000 (Eq. 11), below the bar graphs indicate the relative errors of each parameter. The ochre lines and numbers right specify the overall ipr_i,1000 value for each model and the dashed red line the level of 0.1, i.e., the 10% error.