SFDs of the main belt (blue) and the Vesta family (yellow), used for calibration of our collisional model. The observed SFDs (Bottke et al. 2015b; Harris et al. 2015 and this work) are in agreement with the synthetic SFDs, where the observational bias is negligible (D ≳ 1 km). At sub-kilometre sizes, the SFD of the Vesta family is shallow, similarly as the main belt, due to a collisional cascade. Additionally, the model is constrained by the observed SFD of NEOs, and cratering record at (4) Vesta.