Fig. 1
HB of M 68, with RRL stars overplotted. The entire RRL population is shown in grey, with RR0 as filled circles, RR1 as filled triangles, and RR01 as inverted open triangles. The four stars discussed in this paper are shown as red filled squares (K15 observations) and open green circles (W94), with dashed lines linking their K15 and W94 positions. The vertical dotted line indicates the separation between the loci of RR0 and RR1 stars.
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