Spectra of the CO(4–3) line-emitting sources in our ALMA survey of the MQN01 field. The red lines are the best-fit models to the spectra (yellow bins). The green bins indicate the channels we used to compute the line-velocity integrated maps (see Fig. 7) defined within ±2σ of the best-fitting Gaussian line. The horizontal gray bands are the rms noise in each channel. The blue vertical line indicate the QSO CTS G18.01 systemic velocity. Sources are labeled according to the ID_CO reported in Table 3.