Similar to Fig. 3 but for the HARPS optical spectra. As in that figure, the best available magnetically insensitive line (Fe II 4491 Å) is also shown, and the displayed Gaussians for the lines Fe II 6149 Å and Si II 6699 Å have fixed FWHM = 16 km s⁻¹. This value is based on the Si II 6699 Å, where it gives the best fit to the magnetically split doublet components at such rotation phases as 0.046, 0.793, and 0.923. The Gaussian used to fit the line Fe II 4491 Å has a fixed FWHM = 14 km s⁻¹. Its depth has been fixed to match the observed depth in the ϕ_rot = 0.540 spectrum.