Left panel: 223 high-quality and 29 low-quality Herbig Ae/Be stars in the HR diagram after the cut in astrometric quality described in Eq. (1). Right panel: 218 Herbig Ae/Be stars in the final high-quality sample after removing the five problematic objects described in Sect. 3.1. Those objects present in Table 1 of Thé et al. (1994) are shown in red. The mass of each PMS track (Bressan et al. 2012) is indicated on the right-hand side. An isochrone (Bressan et al. 2012; Marigo et al. 2017) of 2.5 Myr is also shown for reference as a dashed line.