[C II]_{158 μm} and [N II]_{205 μm} line deficits of local (U)LIRGS (shaded gray; Díaz-Santos et al. 2017), the high-redshift galaxy SPT0418-47 (the purple triangle; De Breuck et al. 2019), and high-redshift quasars (the orange pentagon, dark orange star, and dark red circles; Novak et al. 2019; Li et al. 2020; Pensabene et al. 2021, respectively) and companion galaxies (the dark red circles; Pensabene et al. 2021). Our measurements for J1148+5251 are shown via the red squares.