Distributions of transiting multiplicity and, for multitransiting systems, period ratio of adjacent planets, for the 20flat simulation suite. For each system, 1000 “observations” are taken along different lines-of-sight to determine which planets would be observed. The purple line is a set of planetary systems resampled from the original 20flat set such that 88% of them had a post-disk instability, corresponding to the extrapolated value of the Weibull distribution at t=5 Gyr (see text for details). Light gray lines are the observed Kepler population for systems where all transiting planets were smaller than 4 R_⊕.