Amplitude, frequency, and phase of the main pulsation frequency ν₁ as a function of the rotation phase (zero point in time t₀ = BJD 2 459 500.055) for the TESS 2019 (blue), 2021 (red), and 2023 (green) data. Panel a: heavily binned relative instrumental flux with the vertical dashed and dotted lines indicating the phase of the maximum and minimum light, respectively. Panel b: amplitude of the main pulsation signal (a₁) in the various datasets. The black line gives a sinusoidal fit to the 2019 amplitudes with the vertical dashed line indicating the maximum amplitude. Panel c: amplitudes in the 2021 and 2023 data relative to the 2019 amplitudes. Coloured dashed lines and shaded areas give the average ratio and its standard deviation. Panel d: difference (in nHz) of the main pulsation frequency ν₁ to the full-length dataset frequency ν_ref (≡ν₁ in Tables 3 and 4). Panels e, f, g: phase of the main pulsation signal Φ₁. The black lines give the fits to observed values with the vertical dashed lines and grey-shaded areas indicating the minimum phases of the fits and their uncertainties, respectively.