Fig. 5.
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Sulphur-to-silicon abundance ratio vs H I column density. The horizontal dashed line marks the solar ratio, and the vertical line shows the N(H I) limit below which Ellison et al. (2010) observed lower-than-solar abundances in PDLAs (see text). While not in our sample of proximate H2, one PDLA from Ellison et al. (2010), namely J2340-00, also has strong H2 and is marked with a blue circle.
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