Planet mass as a function of stellar mass. Shown in blue are the super-solar metallicities ([Fe/H] > +0.2), in red the solar metallicities (−0.1 < [Fe/H] ≤ +0.2), and in green the sub-solar metallicities ([Fe/H] ≤ −0.1). The curves are the linear fits to the three datasets, colour-coded in the same way. The horizontal lines are the median values in each binned interval. The sub-Jovian planets have been excluded from the plot (see text). The three vertical lines show the approximate separations between the three spectral classes.