Gaia colour vs. absolute magnitude HR diagram. An extinction vector corresponding to A_G = 1 is shown on the bottom left of each plot. Black contours trace Gaia sources within 500 pc with good astrometric solution. Top left: HR diagram of PMS candidates (p ≥ 50%) colour-coded by their associated membership probability. Top right: HR diagram of PMS candidates (p ≥ 50%) with good astrometric solution colour-coded by their associated membership probability and corrected from interstellar extinction. Bottom left: HR diagram of classical Be candidates (p ≥ 50%) colour-coded by their associated membership probability. Bottom right: HR diagram of classical Be candidates (p ≥ 50%) with good astrometric solution colour-coded by their associated membership probability and corrected from interstellar extinction.