HRD with the evolutionary tracks of the 16.9 M_⊙ merger product computed with the 3D MHD simulation (MHD, black dashed line), entropy sorting (ES, red dashed line), PyMMAMS (PM, blue dashed line), and fast accretion (FA, indigo dashed line). The corresponding 17.4 M_⊙, 17.15 M_⊙, 17.0 M_⊙, and 16.9 M_⊙ genuine single stars evolutionary tracks are drawn with grey, orange, cyan, and magenta solid lines, respectively.