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Fig. 2
Synthetic HB morphology for Z = 0.001 and Bw = 104. Here, B, V, and R are the numbers of HB stars located to the left (bluer), within, and to the right (redder) of the RR Lyrae instability strip. The HB stars within the RR Lyrae instability strip are denoted by asterisks, whereas the other HB stars are denoted by dots.
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