Evolution of various parameters as the protostar ages for a final protostellar mass of 0.5 M_⊙. (a) Evolution of envelope and protostellar mass. (b) Evolution of accretion and protostellar luminosity. (c) Evolution of protostellar radius and effective temperature. The filled circles indicate the nine distinct times that we have chosen to run the radiative transfer models. Shaded pink, yellow, and green areas roughly indicate the different classes.