Cumulative distribution (left) and histogram (right) of the period ratios of adjacent planets for the biased 100-embryo population (NG76, in black), the same population but with N-body interactions extended to 100 Myr (NG76longshot, in blue), and the HARPS/Coralie surveys (M11, in red). For the synthetic planets, the values are obtained over 1000 simulated observations of the underlying population and showing the 95% confidence interval. The number of observable pairs is limited, as only systems with multiple planets are usable. The locations of several MMRs are highlighted.