Portion of the archival low-resolution COS G140L spectrum around the C IV λ1549 doublet (upper panel) and He II λ1640 multiplet (lower panel), with velocities in the upper panel relative to the 1548 Å strong line in the rest frame of M87. A linear estimate of the local background is indicated with the black dotted line, and the overall model is shown with the red solid line. These lines have similar v_r to the other FUV lines in this paper, but larger σ_r due to the extended nature of the emission (see Sect. 8.1).