Radial velocities as a function of time obtained by measuring the Doppler shift of Fe i λ5500 Å E_i = 1 eV (blue), 3 eV (red), 5 eV (green) line cores using parabolic fits. Four different line strengths are shown whose EWs are ordered according to their oscillator strength log gf₁ > log gf₂ > log gf₃ > log gf₄. The velocity curves are shifted by 40 km s^-1 relative to each other for clarity.