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. 1999 May 11;96(10):5366–5371. doi: 10.1073/pnas.96.10.5366

Table 8.

Elemental abundances of NGC 6537

Element ΣN(ion)1 N(H+) ICF N(element) N(H+)
He i, ii 0.131 0.131
C iii, iv 1.30(−5) 1.600 2.08(−5)
N ii, iii, iv, v 9.13(−5) 1.087 9.92(−4)
O ii, iii, iv 1.17(−4) 1.215 1.42(−4)
Ne iii, iv, v 3.72(−4) 1.292 4.81(−5)
S ii, iii 1.00(−5) 2.994 2.99(−5)
Cl ii, iii, iv 1.47(−7) 1.894 2.78(−7)
Ar iii, iv, v 2.52(−6) 1.548 4.00(−6)
K iv 2.99(−8) 3.010 1.20(−7)
Ca v 1.79(−8) 7.143 1.28(−7)
Si iii 8.16(−7) 10.89 8.89(−6)

X1,X2(−Y) implies X1 × 10Y, X2 × 10Y. ICF, ionization correction factor.