... PKS 1830-211

Tables 2, 4, 7 and 8 are only available in electronic form at http://www.aanda.org

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... galaxy

We adopt the usual convention to simply denote by C, N, O and S the abundant isotopes ¹²C, ¹⁴N, ¹⁶O and ³²S.

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... averaging

The mean value of the $R_i,\sigma_i$ estimations was calculated as $\bar{R}$ = ( $\sum R_i/\sigma_i^{~2}$)/( $\sum 1/\sigma_i^{~2}$) with a variance $\sigma^{~2}$ = 1/ $(\sum 1/\sigma_i^{~2})$.

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