Emission line spectrum of the secondary. This figure was generated in the same way as for the top-left panel of Fig. 2, but for the full spectroscopic range. The arrows indicate the lines we have identified, while thick arrows indicate those that were used in our radial-velocity analysis. (The color coding on the arrows identifies their species; Balmer lines: red, O ii: blue, C ii and C iii: green, He i: cyan, N ii: purple, Si iii: black, Mg ii: gray.)