Background and source counts map in two energy bands. The images were scaled for better visibility. Detected sources (Src 1, Ps 1 and 2, Geminga) are marked with cyan circles. Local stray light background only present in the background observation is marked with yellow dashed ellipse. VLA 74 MHz contour of IC 443 is overlaid in green (The VLA Low-Frequency Sky Survey Redux (VLSSr) Postage Stamp Server, https://www.cv.nrao.edu/vlss/VLSSpostage.shtml). Our regions of interest (region 1–3) are marked with white circles.