Intrinsic absorption features in the 2013 COS spectrum of NGC 5548. Normalized relative fluxes are plotted as a function of velocity relative to the systemic redshift of z = 0.017175, top to bottom: Si iiiλ1206, Si ivλλ1394,1403, C ivλλ1548,1550, N vλλ1238,1242, and Ly α, as a function of rest-frame velocity. For the doublets the red and blue components are shown in red and blue, respectively. Dotted vertical lines indicate the velocities of the absorption components numbered as in Crenshaw et al. (2003).