Circular means of the power spectrum of the Polaris flare in the PSW (left panels), PMW (middle panels) and PSW (right panels) channels. The bottom panels present plots on the frequency range from 5 × 10^-3 to 10^-1 arcsec^-1. The red lines show the power law P(k) ∝  k^γ adjusted in a frequency range from 10^-3 arcsec^-1 to 3 × 10^-2 arcsec^-1, with γ =  −2.7. The pink solid lines show the optical transfer functions (OTF) for each band.