Spectra of RX 1532, MACS 1447, and CHIPS 1911 BCGs obtained with NOEMA. For each BCG, we considered the total emission component (see Table 2). The solid lines show the continuum-subtracted best fits to the CO emission, where two Gaussian curves are used for MACS 1447 and CHIPS 1911, and one Gaussian only for RX 1532. The flux (y-axis) in units of mJy, is plotted against the relative velocity with respect to the BCG redshift, as in Table 1.