Top: dynamical spectra of the residual He i 5016 Å (left) and He i 6678 Å (right) lines to their respective median profile, phase folded with the rotation period P_rot = 0.897673 d and T₀ = 2 456 185.8380 d, and smoothed slightly with a Gaussian filter for increased visibility. The variability corresponds to at least two co-rotating surface inhomogeneities at the stellar surface, causing the rotational modulation. The amplitude of the residuals to the mean profile is indicated by the gray-scale. Bottom: mean line profile of both He i absorption lines.