Classification boundaries for architecture classes. Left: Boundary between similar and mixed class. The panel show the coefficient of variation for synthetic planetary systems as a function of the number of planets in a system for systems with |C_S(M)| ≤ 0.2. Two clusters are clearly distinguishable, allowing us to fix the boundary between the similar and mixed architecture classes. Right: Boundary between ordered and antiordered. This plot shows the coefficient of similarity of synthetic planetary systems as a function of the Spearman correlation coefficient between the planetary masses and distances of that system. Thick horizontal lines correspond to potential boundaries.