Distributions of the modelled H₂O contents of the investigated exoplanets. Here the H₂O mass fractions are divided into 3% or 6% groups in the top and bottom panels, respectively. The colour indicates the fraction of internal structures within the given percentage groups of the water mass fraction, with the values written on the figure. Probabilities of less than 1% are not shown. Planets with water mass fractions over 30% are shown in the bottom panel. We note the different scales in the two panels.