SFHs drawn from the Monte Carlo realizations of galaxies, which, at z = 0, have masses of M_∗ ≃ 10¹⁰  M_⊙ (left) and M_∗ ≃ 10¹²  M_⊙ (right). The SFHs are obtained by summing over all the progenitors that have merged to form galaxies of the selected final mass. The quiescent star formation is represented by the smooth component of the SFHs, the burst component by the impulsive one. The duration of the SFR-excess phase due to the interactions is represented by the width of the peak of the SFHs.