Properties of the Gaussian fit on the helium signature time series binned by 15 minutes. Top: Gaussian position as a function of phase. The equivalent in velocity relative to the main lines of the triplet is indicated as the top label. Middle: Gaussian Full Width at Half Maximum as a function of phase. Bottom: Gaussian amplitude (equivalent to excess absorption) as a function of phase. The gray dashed horizontal lines are the contact lines from bottom to top: t₁, t₂, t₃, and t₄.