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Fig. 6

image

All Fermi-LAT data from the orbital phase interval Φ = 0.5−1.0, i.e. apastron vs. [(tt0)/1626]. Data up to MJD 56 838 (the time interval in Jaron & Massi 2014) are plotted in black; data newer than that appear in red. The long-term amplitude modulation is clearly visible. The two grey areas indicate the Θ intervals that are removed from the data for the analysis of this paper.

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