Si III λ4574 line time series assuming an inclination of 60°, a projected rotational velocity (υ_e sin i) of 100 km s⁻¹, a cadence of 90 min, and an exposure time (t_exp) of 15 min at V_mag = 4, resulting in a S/N of ≈ 140. Left panel: multimode configuration: a radial mode at 5.25 d⁻¹ with an intrinsic velocity amplitude (υ_amp1) of 21 km s⁻¹ and a sectoral l = m = 2 mode at 5.385 d⁻¹ with υ_amp2 = 21 km s⁻¹. Right panel: single mode configuration: a tesseral (l, m) = (8,6) mode at 5.25 d⁻¹ and with υ_amp = 21 km s⁻¹. The dashed red lines show the noiseless profiles, and the blue lines show the average profile of each series.