Different models of star formation histories (SFH). Each coloured line shows the star formation rate ψ of a galaxy as a function of its age τ, according to empirical (constant SFR, Eq. (1), green; delayed exponential, Eq. (2) with κ = 1, red; log-normal, Eq. (3), yellow) and physically-motivated (In situ, Eq. (4): blue line) models. The vertical dotted line marks the age τquench of a possible abrupt quenching event; solid lines refer to the SFH of objects undergoing quenching, while dashed lines to the SFH of objects for which no quenching occurs.