Power spectral density of the trace of magnetic field and solar wind velocity, left and right panels respectively, for AS1 (blue), AS2 (cyan), AS3 (dark blue), and F (red) data intervals. The PSDs are shown in gray (without smoothing) and colors (Welch method). Green solid lines indicate the PSD best fit along with their scaling exponent. Vertical lines mark the different frequency ranges where PSD fit are performed, corresponding to possible spectral breaks identified from PSD traces of the magnetic field. Colored lines in the bottom of each panel indicate the piecewise compensated spectra for each sector. High-frequency regions where velocity PSDs flatten due to instrumental noise are excluded from the fit.