Mass-transfer rate and (Roche lobe) radii of the RSG remnants orbiting around a BH (panel a) and a NS companion (panel b) as a function of the remaining time until the end of the computation. The solid and dotted grey lines denote radii of RSG remnants and Roche lobe radii, respectively. Mass-transfer rates of the post-CE binary with a BH and a NS companion are shown by the blue and orange lines, respectively. The horizontal dashed black lines indicate the Eddington-limited accretion for different compact objects (1.9 × 10⁻⁷ M_⊙ yr⁻¹ in the panel a for the BH; 1.8 × 10⁻⁸ M_⊙ yr⁻¹ in the panel b for the NS). The shaded grey areas illustrate how much the radii of RSG remnants exceed their Roche radii.