Fourier analysis results for TIC 46054683, as in Figure 2. Panels a-c: Panel c additionally shows the DFT of each segment of the light curves (coloured dotted lines) used to study frequency and amplitude variability of the pulsation modes of this star. Panels d and e: show a zoom into the DFT regions around the two pulsation modes. The DFTs computed from Sectors 71 and 72 are shown in black. The blue line shows a DFT from a shorter segment spanning two rotation periods revealing two rotationally split sidelobes around the mode frequency. The dotted black lines enable visualisation of the window function of the DFT for the two mode frequencies.