Comparison of spectra for the Crab nebula. The spectra shown in red, green, and blue were derived with the reflected background method with HAP, ctools, and Gammapy, respectively. For the HAP analysis, we show the result of the power-law fit in addition. We compute upper limits (95% confidence level) for flux points with a statistical significance of less than two standard deviations. The published spectrum is taken from Aharonian et al. (2006a); it uses a power law with exponential cut-off as spectral model.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.