Global wavelet power spectra (left panels) of light curve from Fig. 1 and corresponding gradients of power spectra (right panels) calculated with different wavelets. The frequency localization of the utilized wavelet is increasing from the top to bottom panels. As in Fig. 1, vertical dashed lines in the left panels indicate the rotation period of the modeled star. Vertical solid lines and numbers in the right panels (not shown in the bottom panel) indicate the positions of the inflection points.