Figure 6a shows the reconstructed light curve ϕ for SGR 1900+14. The grey rectangles indicate the operational down times of the instrument. Figure 6b: snapshot of the entire reconstruction between ≈80 s and ≈91 s. For t ≳ 88 the instrument had an operational down time, leading to zero counts in this time interval. Figure 6c and Figure 6d: reconstructed power spectra as well as their uncertainties, using a smoothness-enforcing prior with σ_sm = 5 × 10⁵ and σ_sm = 10⁵, respectively. The plots have the same volumes and sampling rate as in Fig. 1.