Power spectral density (PSD) of the total magnetic (panel a) and velocity (panel b) field fluctuations for the interval observed by PSP (green) at 0.1 AU, and for the two intervals observed by Solar Orbiter at 0.89 AU (violet) and 0.97 AU (orange). Dotted black lines are the best power-law fits. The relevant slopes, indicated by γ and δ for the inertial and the dissipative ranges, are also reported.