Primary AGN parameters and Eigenvector 1 population distribution of CARS in comparison to 170 AGN at z < 0.06 from the X-ray selected SPIDERS AGN sample (Coffey et al. 2019). Upper panel: broad Hβ FWHM against the Fe II strength as R_Fe II = f(Fe II(4434 − 4685))/f(BLR Hβ). The CARS sample is further color-coded with the Eddington ratio. The formal division between population A and B at Hβ FWHM of 4000 km s⁻¹ is indicated by the dashed line. Lower panel: bolometric luminosity L_bol against M_BH. Lines of constant Eddington ratios are indicated by the dashed line to guide the eye.