Comparison of spectra for RX J1713.7−3946. The spectra shown in green and blue were derived using a 3D likelihood analysis with ctools and Gammapy, respectively, employing an excess template as source model. The butterflies show the fitted power laws. The results are compared to those obtained with the reflected background method using the HAP software (in red). The published spectrum is taken from Abdalla et al. (2018d); it uses a power law with exponential cut-off as spectral model.
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