Near-infrared line profile variability. Top: series of residual near-infrared line profiles HeI (left), Paβ (center), and Brγ (right), plotted superimposed to illustrate their variability. Each color represents a SPIRou run as in Fig. 10. Bottom: 2D periodograms across the line profiles. The color code reflects the periodogram power from zero (blue) to 0.5 (red). The dotted red horizontal line drawn at a frequency of 0.166 day⁻¹ indicates the stellar rotational period. The white curve displays the mean line profile.