**Table 3:** Line ratios and references for the atomic data.
Line ratios	T	C	E
$[\mbox{O {\sc iii}}](\lambda~4959 + \lambda~5007)/\lambda~4363$	[6]	[2]	[1,8]
$[\mbox{N {\sc ii}}](\lambda~6548 + \lambda~6583)/\lambda~5755$	[6]	[2]	[1,9]
$[\mbox{S {\sc ii}}]\lambda~6716/\lambda~6731$	[7,10]	[3]	[1,10]
$[\mbox{Cl {\sc iii}}]\lambda~5517/\lambda~5537$	[11,12]	[4]	[1]
$[\mbox{Ar {\sc iv}}]\lambda~4711/\lambda~4740$	[12,13]	[5]	[1]

References: [1] Bowen (1960); [2] Lennon & Burke (1994); [3] Ramsbottom et al. (1996); [4] Butler & Zeippen (1989); [5] Zeippen et al. (1987), [6] Wiese et al. (1996); [7] Keenan et al. (1993); [8] Moore (1985); [9] Williams & Livio (1995); [10] Verner et al. (1996); [11] Mendoza (1983); [12] Kaufman & Sugar (1986); [13] Mendoza & Zeippen (1982).

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