Top: Series of the near-infrared line profiles HeI 1083 nm, Paβ, and Brγ plotted as a function of JD-2 460 000 (left) and rotational phase (right). The color code corresponds to successive rotational cycles. Middle: Plotted profiles superimposed in a single image to illustrate their variability. The vertical dotted line indicates the stellar rest velocity. Bottom: Two-dimensional periodograms across the line profiles. The color code reflects the periodogram power, ranging from 20 (blue) to 60% (red) of the maximum power. The FAP level of 0.1 is shown as black contours. The horizontal dotted red line drawn at a frequency of 0.195 day⁻¹ indicates the star’s rotational period (P = 5.128 d). The white curve is the mean line profile.