Comparison of the total SED of the HD 37061 system and the location of the individual stars in the sHRD. Upper panel: SED fit of the reddened ATLAS 9 flux (red) to observed UV spectra (black) and photometric measurements (black squares). The inset zooms in on the UV range. The individual contributions of HD 37061 Aa, Ab, B, and C are shown in blue, yellow, magenta, and cyan, respectively. Lower panel: position of the stars in the sHRD. The error ellipses outline 1σ uncertainties; the stars are labelled. Lines of constant log 𝑔 are indicated by dotted magenta lines. The evolutionary tracks of Ekström et al. (2012) for rotating stars (v/v_crit = 0.4) with solar metallicity are overlaid in black. The dash-dotted blue lines are isochrones from Ekström et al. (2012) for log τ_evol(yr) = 6.0, 6.5, and 7.0.