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Fig. 19.

image

Comparison of spectra for PKS 2155−304. The spectra shown in green and blue were derived using a 3D likelihood analysis with ctools and Gammapy, respectively. 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). We compute upper limits (95% confidence level) for flux points with a statistical significance of less than two standard deviations.

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