Evolution in the same parameter space as in Fig. 11 of a reference galaxy that grows by a factor of two in stellar mass according to three different processes: Envelope accretion (green arrow), and major (purple arrow) and minor (gray arrow) dry merging. In all cases, the initial galaxy (red symbol) is assumed to lie on the isothermal MP (dashed line). The final position (blue symbol) of the galaxy in the diagram was calculated using the model described in section 6.2 of Nipoti (2025) for envelope accretion and using the equations of Section 3.1 of Nipoti (2025) for minor (mass ratio ξ = 0.1) and major (mass ratio ξ = 1) dry merging, assuming a size–mass relation slope β_R = 0.76 (see Nipoti 2025).