Power spectrum (not rescaled) similar to the one of Fig. 4, using the same data and mask. Top panel: blue line as the radial power spectrum of the observed fluctuation, PS(Gal_{mock fluc mask})_r, with a scatter associated with the distribution of values found at each radius (lower 16% and higher 84% percentiles in pale-blue and lower 32% and higher 68% in pale-cyan); cyan line as the radial power spectrum of the masked instrumental noise term, $PS(R_{\mathrm{approx}}\times \mathrm{Mask}/{\sqrt{{\mathrm{Gal}}_{\mathrm{mean}}\otimes \mathrm{PSF}}}_{\mathrm{r}}=PS{(R_{\mathrm{approx}}^{\mathrm{norm}})}_{\mathrm{r}}$; the range of frequencies where the fitting is performed (k_fit, i = 75 px⁻¹, k_fit, f = 400 px⁻¹) is marked with a pale-yellow vertical region. Bottom panel: standard deviation associated with the azimuthal average (σ_az).