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Fig. 7.


Upper panel: CO(6-5) (yellow filled histogram) and scaled [CII] (blue histogram) emission lines, extracted from 1 arcsec aperture centered at (RA, Dec) = (23:10:38.90, 18:55:19.82). Zero velocity has been set to the rest frame corresponding to z = 6.0025 for both emission lines. Lower panel: ratio of the CO(6-5) and [CII] spectra in the velocity range [−250,+250] km s−1. The dashed line indicates the velocity-averaged mean ratio. The binning is identical in the upper and lower panels.

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