Hertzsprung-Russell (HR) diagram for Upper Scorpius. A-type through M-type members of Upper Scorpius (Preibisch & Zinnecker 1999; Preibisch et al. 2002; Pecaut et al. 2012) are shown as gray points. A median empirical locus for the population is shown as black solid line with the 99% confidence interval for the median value shown as a light-gray shaded region. Errorbars shown for the majority of stars with T_eff< 5500 K are prescribed as described in Sect. 3.