Panel a: Hertzsprung-Russell (HR) diagram of the studied Be (blue points) and Bn stars (red stars) obtained with apparent (logL∕L_⊙, logT_eff) parameters (not treated for rotational effects). Panel b: HR diagram drawn with parameters corrected for rotational effects, assuming that all stars rotate at Ω∕Ω_c = 0.95. The evolutionary tracks are from Ekström et al. (2012) without rotation a and with rotation, with V_o = 300 km s⁻¹ in the ZAMS b.