Normalised histograms of the parameter A of the fitted model of all MC realizations for every sunspot groups of each dataset. Left-hand panel: the histogram is shown in linear scale, while on the right we plot the distribution of the logarithm of the groups’ area since this allows better visualisation of small and large values. The histograms for the GPR and DPD are in general consistent, however small differences are visible for particular ranges of sunspots’ areas.