Time evolution of the ¹³CO intensity profiles for our grid of models. Rows: models with equal stellar mass; columns: models with equal α_visc. The colors, going from red to blue, show the different time steps. For each model, the radius enclosing 90% of the total flux is denoted by a cross. A low stellar mass corresponds to a low stellar accretion rate, usingthe observational relation shown in Fig. 6 in Alcalá et al. (2017). Also owing the setup, a low α_visc corresponds to a high viscous time (t_visc) and a high initial mass (M_init).