S/N of 2D LS periodograms for six different 5-MHz frequency intervals ([8, 13[ MHz, [13, 18[ MHz, [18, 23[ MHz, [23, 28[ MHz, [28, 33[ MHz, and [33, 38[ MHz). In each panel, the Y -axis represents the LS periodicities, and the X-axis represents the calendar time (in years). The LS periodograms are calculated over a 500 day sliding window, which shifts by two days. The mean time is taken for each window, and the corresponding S/N of the LS periodogram is displayed in grey. The colour bar, thresholded to remove background noise from the periodograms, is the same for all panels. The different dashed red lines give (from top to bottom) the following periodicities: T_{beat D-J}, T_{beat I-J}, T_day/2, T_{beat E-J} (for Europa-Jupiter), T_{beat G-J} (for Ganymede-Jupiter), T_Jupiter, T_{comb D-J}, and T_Jupiter/2. The vertical dotted line indicates the NenuFAR observing phase, from Early Science to Cycle 5.