Accretion luminosity computed from Pf_γ shown as a function of the accretion luminosity computed from Br_α for Class I objects. In the first case, the extinction is derived from the ratio Pf_γ/Br_γ, and in the second it is from Br_α/Br_γ (see Sect. 4.1). Dark blue dots are objects in Ophiuchus; light blue dots are objects in Taurus. Light blue squares are Taurus objects from Beck (2007). The green dashed line shows the locus of equal values.