Fig. 3
Run of the EW of the He I line at 5876 Å as a function of Teff along the BHB of NGC 1851. Overimposed are lines of constant He abundance (log n(He) = 10.6, 10.8, 11.0, 11.2 and 11.4). These curves have been computed for gravities appropriate to the location along the BHB.
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