Pop I+II, Pop III, and the GC population are plotted together with the contours showing the 90% probability region of the estimated medians of ℳ and z, for the three set of populations. The orange, blue, and red contours enclose the 90% probability region of the estimated median values of Pop I+II, Pop III, and the GC population, respectively. The density value shown in the colour bar corresponds to the density values for each of the three sets of the populations normalised individually.