Accretion luminosity divided by stellar luminosity as a function of effective temperature for the all-sky YSOs with accretion luminosity and effective temperature calculated from med-GSP-Phot extinction, from samples A (flag_IR, 4086 sources), B (flag_pEW, 5934 sources), and C (flag_combined, 1871 sources). All sources from sample C are, by definition, also included in sample A and B. Dashed lines trace the locus of chromospheric emission lines when they are erroneously converted into accretion luminosities, as derived in Manara et al. (2017a). 8.44% of sample A and 0.15% of sample B are below the chromospheric emission lines.