Fig. 8
HB stars of 47 Tuc in the V − (B − V) CMD (black dots). Dashed horizontal lines mark the upper and lower magnitude limit of our faint sample. Some synthetic HB models computed by adopting three distinct initial He abundances (Y = 0.26, blue dots, Y = 0.27, magenta dots; and Y = 0.28, red dots) are also shown. See text for details.
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