Evolution of the BH spin parameter, given by Eq. (9), for a set of BH initial masses Mi as a function of accreted mass M0 Eq. (10). The gray areas mark the 1σ and 2σ errors centered on the observed spin parameter for LMC X-3 (see Table 1). The vertical dashed black lines indicate the maximum allowed accreted mass M0, at 2σ limit for an initial non-spinning BH mass of 5 M⊙ (left) and 8 M⊙ (right), respectively.
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