Fig. 16
Lbol versus Menv. Evolutionary tracks are adapted from Saraceno et al. (1996) and Molinari et al. (2008). Labeled arrows indicate (1) the accreation phase and (2) envelope cleaning phase. Sources are coded as a function of their location with respect to the PDR: red squares sources are for the ones observed towards the PDR and blue triangles for those outside. Error bars for Lbol and Menv are shown by gray lines.
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