Fig. 7.
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Low-temperature portion of the HB of NGC 1835 (top panel) compared with those of M 3 (central panel) and M 13 (bottom panel). The CMD of M 3 and M 13 have been shifted to the same distance and reddening of NGC 1835. In all panels, the two dashed lines delimitate the region where most of the RR Lyrae observed at random phases are expected to be located.
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