Reduction of the planetesimal impact heating in case of no sinking relative to the sinking case (Eq. (C.20)). The dots show L_pla,nosink/L_pla,sink as a function of mass for synthetic planets with M_env ≤ 2M_core in the CD777 population at 2 Myr. The color code shows the envelope mass fraction M_env/M. Near crossover, the heating efficiency is reduced by typically a factor ≈3 with a spread of 2.5–8.