Dynamical PDS and mean light curve (white line) resulting from the stacking of all the 4U 1608-52 observations. The image corresponds to the succession of 1 s PDS plotted as a function of time, convolved with a 6 Hz and 20 s averaging kernel for better visibility. Power is color-coded with a linear scale between 2 (black) and 3 (white). We note that the plot starts at –43 s because of an observation gap for burst 21.