Left-hand panels: period ratio distribution of simulations of Model-I with t_start = 0.5 Myr (red), Model-I with t_start = 3.0 Myr (purple), and Model-III with t_start = 0.5 Myr (yellow). In all cases Rocky_peb=0.1 cm. The black lines show the period ratio distribution of detected planet pairs in synthetic observations of our real systems. Solid lines show stable systems. Dashed lines show unstable systems. The gray line shows the Kepler sample. Right-hand panels: p-values of Kolmogorov-Smirnof tests between the Kepler sample and simulated detection of samples mixing different fractions of stable and unstable systems.