Paβ/Brγ ratio for the 19 YSOs in which both lines are detected (black dots and open circles). The shift in Ṁacc to the right for the low-luminosity YSOs (open symbols) after correcting for obscuration as explained in Sect. 7.4 is represented with the horizontal dotted lines. Objects in the ρ-Oph cloud studied by Gatti et al. (2006) are represented with red dots, while Taurus T Tauri stars from Muzerolle et al. (2001) are represented with cyan asterisks.
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