Red and blue sequences for high tangential velocity stars. G_RP − G_BP vs. G Hess diagram for the ACV sample with |b| < 40 deg and with a ϖ∕σ_ϖ > 5 and V_t > 150 km s⁻¹. A PARSEC isochrone with [M/H] = −0.5 and age of 11 Gyr is shown in blue (but shifted by 0.04 in colour and 0.2 in magnitude in order to match the gap between blue and red sequences). The inset histogram shows the colour distribution in the magnitude range of the MSTO (shown as dashed lines in the main figure). A clear separation in two sequences is clearly seen as originally noted in Gaia Collaboration (2018a) with DR2 data. An animated version of this figure for varying V_t limits is available online.