Fig. 1
CO spectra of the observed group-dominant galaxies. In each column, the left-hand panel is the CO(1–0), and right-hand panel the CO(2–1) lines. The velocity scale is relative to the redshift displayed in Table 1. The vertical scale is Tmb in mK. All spectra have been plotted to the same scale, except the CO-rich NGC 940 galaxy, at the bottom.
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