Equivalent width ratio W_{0,  Fe   ii}/W_{0,  C   ii}, is plotted as a function of W_{0,  C   ii}. DLAs where narrow Lyα emission is detected are marked by blue circles, and DLAs without a 4-σ detection are marked by red triangles. Filled symbols indicate that W₀ is measured from the fit to the absorption line, and empty symbols indicate that W₀ is estimated from the flux. One spectrum has flux problems at the location of the C ii – 1334 Å absorption, and Fe ii – 2344 Å is redshifted out of the spectrum in two cases. Twenty-nine of the 31 DLAs in the statistical sample are plotted here, 7 with an emission detection and 22 without.