Gaia DR2 photometry and RV. Bottom: Colour–magnitude diagram for Gaia DR2 within 20′ around FSR 1776. The brightest stars (G ≲ 14 mag) that have RV information are shown in blue. Top left: Colour vs. RV, where it is clear that there is a group of low RV and colour dispersion with BP-RP< 1.2 and another with larger RV and colour dispersion with BP-RP > 1.2. Top right: Histogram of RV for stars with BP-RP< 1.2 and BP-RP > 1.2 representing the younger disc (grey) and the older bulge (blue) components. It is evident that the assumptions for disc and bulge RV and dispersion in Sect. 3 are consistent with Gaia data.