Comparison of old and new evolution models, with respect to the sample of SMC evolved stars from Bouret et al. (2021): AV 15, AV 43, AV 47, AV 69, AV 75, AV 77, AV 83, AV 95, AV 170, AV 232, AV 307, AV 327, and AV 439. Left panel: spectroscopic HR diagram showing T_eff vs. $\mathcal{L}(=T_{\mathrm{eff}}^4/g)$; and the 2, 4, 6, and 8 Myr isochrones for old and new tracks are shown in magenta (dashed and solid lines, respectively). Right panel: hunter diagram (Hunter et al. 2009), showing the correlation between nitrogen enrichment and rotational velocity. The studied stars are labelled with their names, and their full properties are listed in Table 3. Because of its low N/H, AV 69 lies out of the plot range in the right panel.