Fraction of G3RV2 stars with |R − R_g|< 0.25 kpc. The coloured points correspond to the location of the high-mass star-forming regions from Reid et al. (2019) associated with Scutum-Centaurus (blue) and Sagittarius (magenta) and the Local (cyan) and Perseus (black) arms. A star symbol corresponds to the location of the Sun, and the grey oval represents the orientation of ≈4.6 kpc long Milky Way bar (Wegg et al. 2015).