VHE spectrum of PKS 1510−089 measured with the H.E.S.S. instrument, during March 2009. The solid line is the best-fit power law obtained using the forward-folding method (see text for details). The butterfly is the 68% confidence band, and the points with errorbars (1σ statistical errors) are the energy flux. Arrows denote the 99% C.L. upper limits.
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