Mass, timescale, and infall rate with respect to the distance to the protostar along the streamline. Δt_in is obtained from the model with M_env = 0.39 M_⊙. The dotted line represents the mean infall rate obtained with the free-fall timescale from rest, , whereas the dashed line marks the mean infall rate obtained from the streamline model, (see Table 4). The blue and green areas correspond to the estimated accretion rates at the birthline (BL) and after 1 Myr of birth (Fiorellino et al. 2021). Systematic errors are plotted as vertical bars and are 15% of the nominal values. Random errors represent around 5%.