Ten thousand random parameter combinations were considered using a uniform distribution of the ranges given in Table 1 to calculate the cutoff between rocky and gas-enveloped planets. The number of resulting surface radii, R_s, at which the cutoff occurred for each parameter combination is shown in the histogram. The black dot and error bar show the mean cutoff of the distribution at 1.76 ± 0.38 R_⊕ from our model with 2σ uncertainty. The red dot shows the observed ﹩{1.62}_{-0.08}^{+0.67}\,{R}_{\oplus }﹩ measurement with 2σ uncertainty from Rogers (2015).