Fig. 1.
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Observed spectra in a velocity range from −2500 km s−1 to 2500 km s−1 of all objects, where the zero velocity is the optical redshift. The background blue curves are the stacked and smoothed spectra. The orange shadow represents the 1σ standard deviation of the continuum, and the gray region marks the CO emission line. The best-fit Gaussian profile is marked by the red curve.
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