Averaged AIA 1600 Å PSDs (black line) for the entire FoV, network and cell (first, second and third column) for targets 2–7 (top to bottom row); the corresponding fittings with Eq. (2) are plotted with a red line, and the residuals (observed PSDs – fittings) with a blue line. All PSDs have been scaled by a factor equal to 5760 DN s⁻² Hz⁻¹; DN correspond to the digital numbers recorded by AIA.