Hertzsprung-Russell diagram of the RSGs in the SMC. The contours show the probability density of the position of RSGs that lose mass according to Ṁ_Y23 and Ṁ_J88 (top panel) or Ṁ_B20 and Ṁ_K21 (bottom), with contour levels denoting the 68%, 95%, and 99% confidence regions. Representative stellar tracks for various initial masses are also displayed, with points corresponding to evenly spaced timesteps of 2 × 10³ years. Grey points depict the observed RSGs from Yang et al. (2023) refined sample. We only show the results inside the conservative limits for a RSG of L_min and T_eff, max.