Q_PR values for grain sizes s ∼ 0.1300 μm (left) and the corresponding β_PR values (right ; analogous to Fig. 7 of Rigley & Wyatt 2020). The solid lines show the numerical values for the different stellar spectral types used in this study, while the dashed lines (right panel) indicate the analytical β_PR values using Q_PR = 1 (Eq. (2)). The black dots mark the discrete grain sizes adopted in the main study. The dotted black line (right panel) denotes β_PR = 0.5. Sizes above this threshold, corresponding to grains blown out of the system for circular orbits, are marked with cross (×) symbols. The size ∼50 μm used in the pilot study is safely higher than the blowout size and meets the assumption of Q_PR ∼ 1.