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Table 4

Atomic data used in our abundance determinations.

Ion Collision strengths Radiative transition probabilities

O ii Kisielius et al. (2009) Zeippen (1982)
O iii Aggarwal & Keenan (1999) Galavis et al. (1997), Storey & Zeippen (2000)
N ii Tayal (2011) Galavis et al. (1997)
Ne iii McLaughlin & Bell (2000) Galavis et al. (1997)
S ii Tayal & Zatsarinny (2010) Mendoza & Zeippen (1982)
S iii Tayal & Gupta (1999) Froese Fischer et al. (2006)
Ar iii Munoz Burgos et al. (2009) Munoz Burgos et al. (2009)
Ar iv Ramsbottom et al. (1997) Mendoza & Zeippen (1982)

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