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Fig. 3.

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Baseline-subtracted spectra of KiDS 0920 (top row), KiDS 1220 (center row), and KiDS 1444 (bottom row). The targeted CO(J→J–1) lines are reported in the top-left corner of each plot. Solid lines show the Gaussian fits to the emission lines, in the event of detection. See text for details. In all panels the flux (y axis) is plotted against the relative velocity with respect to the BCG redshift, as in Table 1 (bottom x axis) and the observer frame frequency (top x axis).

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