Dependence of the resultant planetesimal belt on the Stokes number, τ_s (blue for τ_s = 0.01, green for τ_s = 0.03, and red for τ_s = 0.1, respectively). Left panel: resultant midplane pebble-to-gas ratio of the spatial density, Z = ρ_p/ρ_g, after the establishment of the steady-state. Middle panel: resultant planetesimal surface density at t = 100 kyr since the start of planetesimal formation. The gray line is the classical minimum mass solar nebula model (MMSN; Σ_pla = 30(r/1 au)^−3/2 g cm⁻²) of Weidenschilling (1977). Right panel: cumulative mass of planetesimals, M_pla,tot, formed by the ND mechanism since the start of planetesimal formation. The thin dashed line is analytically derived cumulative mass of planetesimals with τ_s = 0.1. Here, Disk 2, α_acc = 10⁻², Ṁ_g = 10⁻⁸ M_⊙ yr⁻¹, F_p/g = 0.47, and k_SI = 10⁻³ are used.