Fig. 4
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Light curve of η Carinae using the HE dataset (10–500 GeV), with 8 bins per orbit (253.0 days). In red, P2009, P2014, and P2020 periastron passages. At least 5σ are required per detection in each bin, while a 2σ upper limit is shown otherwise. We do not observe variations of the spectral index beyond statistical uncertainties.
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