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Fig. 4


The Crab Nebula as detected by IBIS/ISGRI in the soft γ-ray domain with 3 Ms of exposure. Left and right top panels: the ISGRI 40–100 keV shadowgram accumulated during one ScW (No. 010200210010) and the decoded sky image. Left bottom panel: sky mosaic in 431–471 keV (colorbar:  − 2–8σ). Right bottom panel: sky mosaic in 491–531 keV (colorbar: 3–4σ).

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