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Table 11

Number of stars of different populations of M 22.

Population FG SG-I SG-E Total

RGB: Marino et al. (2011a)

Metal-poor 12 4 5 21
Metal-Rich 9 5 14

Frequency over the RGB and SGB (Marino et al. 2011a,b)

Metal-poor 0.34 0.11 0.14 0.60
Metal-rich 0.26 0.14 0.40

BHB: This paper

Metal-poor 49 23 72
Metal-rich 20 20

Frequency over the whole HB

Metal-poor 0.39 0.15 ~0.14 ~0.68
Metal-rich >0.14 ~0.14 ~0.32

Notes. FG = first generation with primordial composition (normal He, low Na, high O); SG-I = second generation with intermediate composition (moderately high He and Na, moderately low O); SG-E = second generation with extreme characteristics (very high He and Na, very low O).

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