[C II] line luminosity as a function of FIR luminosity. Our five CARS targets are shown as red triangles compared to the literature compilation of Herrera-Camus et al. (2018a): normal star-forming and star-burst galaxies (green circles), AGN host galaxies (purple triangles), LINER galaxies (orange upside-down triangles), and high-redshift galaxies including the samples from Brisbin et al. (2015) and Decarli et al. (2018) (brown diamonds). The blue line is the mean of the low-redshift galaxies distribution, and the blue-shaded areas correspond to 1, 2, and 3σ. Pink and purple shades represent LIRG L_FIR >  10¹¹ and ULIRG L_FIR >  10¹² regimes. The luminosities for 3C 326 are taken from Guillard et al. (2015).