Left: SN 2024abfo bolometric light curve along with our best-fit core model of Nagy & Vinkó (2016) with and without γ-ray leakage (dashed and solid lines, respectively). The dotted line is the shell component for an envelope with a radius of 120 R_⊙ and a mass of 0.005 M_⊙. Right: Constrained parameter space for varying shell radius and envelope mass. The colour bar denotes the ratio of the total (core+shell) model luminosity with respect to the measured luminosity at 2.5 days. The contour line indicates where the model luminosity is equal to the measured luminosity. We regard all models to the left of this line to be consistent with our observations. The dashed red line and shaded region correspond to the radius we measured for the progenitor from single star models (Section 4.4). The corresponding shell model light curve for the parameters at the position of the red star are shown in the left panel.