Relationship between the present day star formation rate and the stellar mass (main sequence) derived from the SED fitting code. Left panel: symbols are coded according to the quenching factor of the analysed galaxies. Blue filled squares, green triangles, and red circles are for galaxies where the derived quenching factor is QF ≤ 0.5, 0.5 < QF ≤ 0.8, and QF > 0.8, respectively. Magenta triangles indicate upper limits to the star formation rate of early-type galaxies. The solid line shows the bisector fit to the data for unperturbed galaxies (QF ≤ 0.5). Right panel: same relation with colour symbols coded according to the quenching age. Black filled dots are for unperturbed galaxies (QF ≤ 0.5), cyan triangles, yellow squares, and dark green dots for galaxies with a quenching age QA < 200 Myr, 200 < QA < 500 Myr, and QA > 500 Myr, respectively. The large orange filled squares indicate the models of Boselli et al. (2006; 2014c) for unperturbed galaxies of spin parameter λ = 0.05 and rotational velocity 70, 100, 130, 170, and 220 km s^-1. The magenta lines indicate the starvation models. The black and grey lines show the ram-pressure-stripping models for a stripping efficiency ϵ₀ = 1.2 M_⊙ kpc^-2 yr^-1 and ϵ₀ = 0.4 M_⊙ kpc^-2 yr^-1, respectively. Different symbols in the models indicate the position of the model galaxies at a given look-back time from the beginning of the interaction.