Influence of sublimation and fragmentation on the accretion efficiency from OL18 (top) and IGM16 (bottom) within the snowline of a 1.00 M_⊙ star. The accretion efficiencies are calculated for a 10⁻³ M_E planetesimal. The line styles match those in Fig. A.1. Fragmentation causes a sudden decrease in accretion efficiency at the snowline, especially after 0.01 and 1.0 Myr, due to the τ_s becoming so small that pebbles couple to the gas. Without fragmentation, the efficiency rapidly decreases in the inner regions of the disc (≲ 0.2 au), due to τ_s becoming too large for pebbles to settle. The sudden and sharp increase in ϵ_IGM16 in the innermost part of the disc is an unintended modelling effect from the accretion impact parameter B becoming smaller than the planet radius R_pl.