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Table 3

Number of Na atoms obtained by different authors.

Reference article SNa

Ip (1991) 1.8−3.7 × 104
Cintala (1992) 6.3 × 103
Smyth & Marconi (1995) 2−3 × 104
Flynn & Mendillo (1995) 9.2 × 104
Morgan & Killen (1997) 3 × 104
Wilson et al. (1999) 1.8 × 104
Bruno et al. (2006) 3−4.9 × 104
Lee et al. (2011) 1.8 × 104

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