Same as Figs. 2 and 3, but using the whole data set (1999–2012). Upper panels: amplitude spectrum of the data and of the residuals (on the same vertical scale) after subtracting the four main pulsation frequencies (f₁ to f₄). We note that the residual power is significantly higher than in Fig. 3. The small box shows the normalized spectral window (red) with the one-day aliases at ±11.57 μHz. Lower panels (from top to bottom): normalized spectral window (red) with the 1-year aliases at ±31.7 nHz, and details of the amplitude spectrum of data and residuals near f₁ (left) and f₂ (right). The horizontal scale in the left and right panels is the same. Two vertical dashed lines (green) highlight two components of a possible rotational splitting. See text for more details.