Spectroscopic HR diagrams showing the location of massive stars exhibiting low-frequency stochastic variability and analysed by Bowman et al. (2020). The spectroscopic luminosity is defined as , where T_eff and g denote the effective temperature and surface gravity of a star, respectively. The circles with error bars mark the position of the ExtEEV using its physical properties estimated by Jaya21. The colour and size of a symbol reflects the value of α₀ (left) and f_char (right). Solid lines show MIST [Fe/H]  =  0, v/v_crit = 0 evolutionary tracks (Choi et al. 2016; Dotter 2016) starting at the zero-age main sequence (ZAMS). The dashed-line evolutionary track corresponds to the suspected mass of the ExtEEV, 34.5 M_⊙, assuming a mean metallicity of stars in the LMC, [Fe/H]  = − 0.4 and v/v_crit = 0.4.