Fig. 9.
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Possible initial masses of R136a1 from single star and stellar merger origins. The shaded areas show the primary and secondary ZAMS masses of stars that merge during evolution and overlap in the HRD with the observed location of R136a1. The blue, green, and pink show results from Ṁrdw ṀΓe, and ṀL/M, respectively. The dashed histograms show the initial mass from single stellar evolution.
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