Location of HD 93840 in two diagnostic diagrams, the sHRD (upper panel) and the HRD (lower panel). Parameters derived via ADS (dots), FASTWIND (squares), and TLUSTY (triangle) considering the spectroscopic and Gaia-based distances (i.e. d_spec and $d_{Gaia}^{\text{MA},\text{EB}}$, see Appendix B), are depicted as black and red symbols, respectively. The lightgrey boxes span the parameter range obtained when accounting in addition to parallax bias according to Maíz Apellániz (2022), while the darkgrey box represents the finally adopted solution from Table 1. For comparison, loci of evolution tracks for stars rotating at Ω_rot = 0.568 Ω_crit (Ekström et al. 2012) are indicated for various zero-age main-sequence (ZAMS) masses. Isochrones for the model grid, corresponding to ages of log τ_evol ∈ {6.95, 7.05, 7.20} are shown as dotted lines in the upper panel (with age increasing from top to bottom). Error bars indicate 1σ uncertainty ranges. See the text for a discussion.