log L_acc as a function of the wavelength for CTTS in the OB1, σOri, ϵCha and Corona Australis star forming regions. The orange line represents the log $L_{\text{acc\hspace{0.17em}}}^{XS}$ computed using the XS-fit method and its associated extinction value ($A_V^{XS}$). The blue dots show log $L_{\mathrm{a}\mathrm{c}\mathrm{c}}^{\mathrm{lines}}$ (Table A.1) calculated from the accretion tracers using the empirical relations from Alcalá et al. (2014), with fluxes dereddened using $A_V^{XS}$. Similarly, the red dots represent $L_{\text{acc\hspace{0.17em}}}^{line-diff}$, computed from the same accretion tracers but with fluxes dereddened using $A_V^{diff}$ (see Sect. 3.6 and Table 1). The blue and red dashed lines indicate the mean log L_acc values for the accretion tracers log L_acc,i in their respective colors.