Fig. 4.
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Mean V magnitude (Clement et al. 2001) versus period of pulsation for the RRLs of NGC 6266, NGC 6441, and NGC 6626. The stars are colour-coded by the derived membership, and the empty symbols correspond to stars that were removed using the sigma clipping method (median ± 2σ). The dashed black line represents the weighted average, and the dotted lines give the standard error and the 2σ level.
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