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Table 5:

Gas phase abundance of Fe+ and Si+ from line ratios to sulphur.

Position: 		R1+R2 LL1 LL2 B2+B3
$[{\rm Fe}^+_{\rm gas}]/[{\rm Fe}_{\odot}]^a$ 4-9 $\times$ 10-2 3-6 $\times$ 10-2 2-4 $\times$ 10-2 2-4 $\times$ 10-2
$[{\rm Fe}^+_{\rm gas}]/[{\rm Fe}_{\odot}]^b$ 10-20 $\times$ 10-2 7-10 $\times$ 10-2 5-7 $\times$ 10-2 5-7 $\times$ 10-2
$[{\rm Si}^+_{\rm gas}]/[{\rm Si}_{\odot}]^a$ 4-9 $\times$ 10-2 2-4 $\times$ 10-2 1.5-3 $\times$ 10-2 2-4 $\times$ 10-2
$[{\rm Si}^+_{\rm gas}]/[{\rm Si}_{\odot}]^b$ 10-20 $\times$ 10-2 5-8 $\times$ 10-2 3-6 $\times$ 10-2 4-7 $\times$ 10-2

Notes. (a) assuming only collisions with electrons ( $n_{\rm e}=100{-}400$ cm-3) and $T_{\rm e}=700$ K (lower value) and 3000 K (upper value). (b) including excitation of sulfur by atomic hydrogen with $n({\rm H})=10^4$ cm-3.


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