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Fig. 2
Metallicity versus H i column density. Data samples and corresponding symbols are as in Fig. 2. Filled (resp. unfilled) circles represent systems in which H2 has been detected with log N(H2) ≥ 17 (resp. log N(H2) < 17). The dotted (resp. dashed) line represents a constant log N(Zn ii) = 12.5 (resp. log N(Zn ii) = 13.15).
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