LE 2–10 keV (upper-left panel), HE 28–200 keV PDS (upper-right panel), and the real (lower-left panel) and imaginary (lower-right panel) parts of the rotated CS of Swift J1727.8–1613 for the data shown in Fig. 3, fitted with a model (solid lines) consisting of 12 Lorentzians. Individual components are plotted with colored dotted lines. The fits were done assuming the constant phase-lag model. For a clear presentation of the real and imaginary parts of the cross spectrum, data with absolute values greater than or equal to 5 × 10⁻⁴ are scaled logarithmically, while values with absolute values smaller than 5 × 10⁻⁴ are scaled linearly.