Fraction of the stellar mass accumulated during outbursts as a function of the fraction of the protostellar phase spent in outbursts. Each curve corresponds to a case where the accretion rate during outbursts exceeds that of the accretion rate in adjacent periods of quiescence by the indicated factor. The indicated ratio of post- to pre-burst accretion rates is an upper bound to the ratio of post- to pre-burst luminosities.