Statistics of collision parameters computed from 2D simulations

There are two popular ways to speed up simulations of planet formation via increasing the collision probability: ({\it i}) confine motion 2D, ii}) artificially enhance physical radii bodies by an expansion factor. In this paper I have performed 100 each containing $10^4$ interacting and computed parameters from results runs. Each run was executed for a lower higher accuracy parameter. The main goal is determine probability distribution functions their dependence on A simple method devised improve determination simulation data. It shown that impact parameter uniform independent For real collisions velocity greater than 1 mutual escape velocity, finding can be explained using two-body problem. casts some doubts terrestrial planets' final accretion assumed merge. Collision outcome maps were created adopting fragmentation model \cite{Leinhardt2012} estimate number different types collisions. detailed comparison with earlier works indicates there similarities as well significant differences between works. indicate planetary disc matures masses differs progressively majority lead mass growth either partial or graze-and-merge collision.