Fig. 1.
223 Herbig Ae/Be stars in the HR diagram satisfying Eq. (1) constraint. In most cases vertical error bars are dominated by parallax uncertainties. Sources with a white dot have been classified as binaries. The mass of each PMS track (Bressan et al. 2012) is indicated on the righthand side. An isochrone (Bressan et al. 2012; Marigo et al. 2017) of 2.5 Myr is also shown for reference as a dashed line.
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