Fig. 1.
From left to right: CO(4-3), [CI](1-0), CO(7-6) + [CI](2-1) peak line spectra in BX610. Bottom axes give observed frequency and top axes give velocity with respect to BX610 rest frame. Respective channel widths for each spectrum are 50, 50, and 45 km s−1. Velocities are based on a redshift of z = 2.2103 and the velocity in the third panel is based on CO(7-6). Gaussian fits to each line are shown in red. For CO(7-6) + [C I](2-1) the Gaussian parameters were allowed to vary independently and their combined flux densities were fit to the spectrum.
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