Cumulative distributions of planet pairs in the vicinity of the 2:1 and 3:2 mean-motion resonances (the statistics of both resonances are accumulated) for the three groups defined in Fig. 2 (see also Sect. 2) Using K-S tests to compare these distributions, we obtain p-values of 0.08% (red and blue distributions), 10% (blue and green), and 3.5% (green and red). See text for discussion.