SED of RX J1713.7–3946 derived using csspec. Red data represent the unbinned ctools analysis, blue data are the values from Table F.1 of H.E.S.S. Collaboration (2018b). 68% confidence level upper limits are displayed when the statistical error exceeds the value of a flux point. The red line is the fitted exponentially cut-off power-law spectral model, the light red band is the 68% confidence level uncertainty band of the spectral model and was determined using ctbutterfly. The blue line is the exponentially cut-off power-law spectral model determined by H.E.S.S. Collaboration (2018b).