Cumulative distributions of spin parameters for (1) branches 3 and 4; (2) branches 3 and 4 while excluding millisecond pulsars; and (3) branch 3, level 3, sub-branches 2 and 4. We indicate the p-values obtained by performing a two-sample Kolmogorov-Smirnov test between the samples of both branches compared in each panel. Marginal differences can be found on the spin period between branches 3 and 4 when considering normal pulsars only.