Fig. C.2
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Parameter error ellipses on the amplitude (integral flux for NuSTAR) and spectral index for the power-law fit to the Fermi-LAT, NuSTAR A+B and Swift-XRT datasets. Contours in black correspond to gammapy, while the native tool contours are shown in red. For NuSTAR, the contours obtained with the Poisson or OFF background estimate are shown in blue for reference.
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