SED of MSH 15–52 derived using csspec. Red data represent the results of the unbinned ctools analyses; blue data are the values from Fig. 3 in Aharonian et al. (2005). The dashed red line is the fitted power-law spectral model, the full red line is the fitted exponentially cut-off power law spectral model. The light red bands are the 68% confidence level uncertainty bands of the spectral models and were determined using ctbutterfly for unbinned analyses. The 68% confidence level upper limits are displayed when the statistical error exceeds the value of a flux point.