Azimutal integral of 2D power spectra computed from B_∥ maps: from multi-resolution inversion (black), from rMHD simulation with frequency cut-off filter corresponding to d = 1 m (blue) and d = 0.5 m (red). The theoretical cut-off limits of 0.5 m and 1.0 m aperture telescopes (λ/d) are indicated with light-gray and dark-gray vertical lines. The green curve illustrates the power spectra of a multi-resolution inversion performed with less noisy data (σ = 10⁻⁴).