CO(1–0) emission line of SDSS J160705+533558. The extracted CO(1–0) line spectra of the quasar, its companion, and the additional source to the south of the quasar. The spectra are binned to 72.6 km s⁻¹ per channel, and the continuum is subtracted. The dashed blue curves show the Gaussian fits to the line profiles. The vertical dashed line indicates the optical redshift of the quasar (z = 3.653). The top-axis show the relative velocity offset with respect to the optical redshift of the quasar.