Comparison of real and simulated images for AIA 193, 211, and 171 Å channels (from left to right, top row) and HRI_EUV (top right panel) for the cross-calibration factor k = 1.4 for 30 May 2020. Each panel is split into two parts with the simulated part (top left) and the real part (bottom right) part. The FOV of these images is shown in Fig. 1. The plots under each panel show the histograms of the signal.