Significance maps and radial excess distributions of the η Car periastron dataset (DS-C). The resulting significance maps for CT5 mono (upper left) and CT1–4 stereo (upper right) are shown with correlation radii of 0.13° and 0.09°, respectively. The position of η Car is marked with a red cross. Additionally, all other Fermi-LAT 4FGL sources (Abdollahi et al. 2022b) in the FoV are marked. The radial excess distributions for mono (lower left) and stereo (lower right) analyses are centred on the η Car position. They are compared to the PSF derived from simulations with an assumed index of 3.3. The scale of the PSF was matched to the first bin.