G−V_T colors as a function of the synthetic B_T−V_T color. Both the observed (or photometric) and the synthetic (using the corrected G passband and the new zero point) values are shown for the vertical axis. The green line is the cubic polynomial fit of van Leeuwen et al. (2017). The other four lines show synthetic photometry for main sequence (MS) and supergiant (SG) solar-metallicity 4000−40 000 K models with no extinction and with E(4405−5495) = 0.25 and R₅₄₉₅ = 3.1 from Maíz Apellániz (2013) and Maíz Apellániz et al. (2014).