Normalised fraction of near-MMRs pairs, ${\widehat{F}}_{\text{MMR}}$ (solid points) with 1σ uncertainties (vertical bars) for all actual planet pairs, sub-Neptune pairs, and super-Earth planet pairs in Kepler multiple transiting systems. The two horizontal solid lines and shaded regions represent the theoretical predictions and 1σ uncertainties of water-rich (blue) and water-poor planet pairs (red) derived from the synthetic sample. The two horizontal dashed lines denote the theoretical predictions of simulated sub-Neptune (brown) and super-Earth (green) pairs derived from the synthetic sample. The result of the randomly paired control sample is plotted as a dotted black line and by definition is equal to unity.