Discovery of a Perseus-like cloud in the early Universe - H I-to-H transition, carbon monoxide and small dust grains at z 2.53 towards the quasar J00000048

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Fig. 13

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Portion of the X-shooter NIR spectrum around the Na i doublet. Na iλ5891 and Na iλ5897 are redshifted at 2.077 and 2.079 μm, respectively. The red curve corresponds to the Voigt-profile fit using fixed velocity decomposition from Mg i.

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