Stacked Stokes I profiles (top plots) and 2D periodograms (bottom plots) of the 1083.3 nm He I IRT in the stellar rest frame for seasons 2024 (left panels) and 2025 (right panels). The dashed horizontal line traces P_rot and the vertical dotted lines depict the velocities of the three components of the He I triplet. The color-scale traces the logarithmic power in the periodogram. Only the main peaks (yellow to red and extending over several velocity bins) are likely to be significant.