Sum of planetesimal mass in each bin for all mass planetesimals (red + blue) and for the simulated mass branch (blue) versus the initial planetesimal mass (size) from Eq. (18). The initial mass function of planetesimals was based on streaming instability simulations with a minimum mass of 10⁻⁶   M_⊕ (100 km) and a characteristic mass of 1.6 × 10⁻⁵ M_⊕ (250 km). We separate this distribution into different mass bins.