Mass of stellar particles inside the simulations at any time (cumulative star formation minus stellar mass lost to tides and supernova explosions). ISO is the pseudo-isothermal model in isolation, RPS-50 with a perigalacticon of 50 kpc, and RPS-100 with a perigalacticon of 100 kpc. NISO is the NFW model in isolation, NRPS-50 with a perigalacticon of 50 kpc, and NRPS-100 with a perigalacticon of 100 kpc. The time of infall (before which all simulations are identical) is shown with a black dashed line, approximate perigalacticons are shown with a dot-dash line in the relevant colour and apogalacticons in a dotted line. In all cases, the peri-/apogalacticon shown is of the pivot and the actual peri-/apogalacticons of the dwarf may differ slightly in time.