Fig. 1.

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HRD with MS evolutionary tracks for the 16.9 M⊙ 3D MHD merger product (black dashed line) and the 17.4 M⊙ genuine single star (green solid line). The grey and lime-coloured horizontal markers indicate different evolutionary stages, using the central hydrogen mass fraction Xc as a proxy for the evolutionary age, for the merger product and genuine single star, respectively.
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