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Fig. 3


Spectrum of SHBL J001355.9–185406 measured with H.E.S.S. using the Model analysis. Top panel: the butterfly represents the 1σ contour for the best-fit model. The spectrum is obtained with the forward-folding method in Piron et al. (2001). The data points are derived a posteriori and should be considered as residuals. For bins with a significance below 2σ, upper limits at the 95% confidence level are computed. The inset gives the 1, 2, and 3σ confidence levels in the power-law index vs differential flux at 1 TeV plane. Bottom panel: residuals of the fit, with the binning used in the forward-folding method.

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