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Fig. 2.

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Initial orbital period and initial mass ratio of models of considered binary evolution grid with an initial donor mass of 44.6 M (small squares). We only show models that do not merge during the fast Case A mass transfer (see Figs. 1 and F.1 of Sen et al. 2022). The colour indicates the fraction of the lifetime of the donor after the fast Case A mass-transfer phase during which the donor is more massive than the accretor (see colour bar to the right). The model discussed in the right panel of Fig. A.1 is highlighted with a black frame. The large red diamond and large blue square show the estimated positions of VFTS 094 and VFTS 176 assuming a highly non-conservative mass transfer, respectively (see text).

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