Observational HRDs using the Gaia G and G_RP passbands, with corrections applied to the G passband. An extinction vector with A_V = 1 mag is shown as black arrow. The isochrones correspond to ages of 1, 5 and 10 Myr (see legend). The iso-mass lines (left: orange, right: blue) for 0.09 M_⊙ and 1 M_⊙ include stars with ages from 0.1 to 100 Myr. A control sample is shown in gray in the back. Left: comparing known (blue) and new (red) sources in ρ Oph. Right: comparing the two populations in ρ Oph, with Pop 1 in red and Pop 2 in yellow.