Violin plots showing the uncertainty distribution for all two-zone parameters (Table C.4). For the left part of the plot (left of the dashed black line; linearly sampled parameters) the uncertainties are given in absolute values x_errr according to Eq. (8) corresponding to the left axis. For the right part of the plot (logarithmically sampled parameters), the uncertainties are given as factors f_errr (Eq. (7)) corresponding to the right axis. Every violin depicts the distribution of uncertainties for an individual parameter. The upper, middle, and lower line encode the maximal, median, and minimal uncertainty in the sample, respectively.