Notes. The different groups identified by Bacon et al. (2015) at different redshifts (z; via different optical lines, lines_opt) for which the selected spectral tuning covers the expected observed frequency (ν_obs) of redshifted CO transitions (CO J_up). The number of constituents of each group is reported in column N_m. The systemic velocity of groups identified via the Lyman-α line is uncertain because this line tends to be significantly offset with respect to the systemic redshift of the host galaxy (e.g., Verhamme et al. 2018). aThe [CI] (1-0) emission from this group is also covered by the lowest-frequency SPW.