Spectra of [C II] emission toward BRI0952 and companions. The two companions’ line profiles are fit with a single Gaussian, which is shown in red. The quasar’s line emission profile is fit with a single Gaussian (red) and a double Gaussian (blue); the double Gaussian corresponding to outflow signatures is clearly seen. The gray region represents the rms of the data in each channel using the procedure described in Sect. 3.2.2.