Fig. A.1.

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Upper panel: Map of the H.E.S.S. γ-ray signal significance above 2 TeV, with contours corresponding to 2σ, 3σ, 5σ, 9σ and 12σ significance levels Li & Ma (1983). The map has been obtained with the Adaptive Ring Background estimation method, and centered at the position of HESS J1702-420A. Overlaid on the map are the concentric regions – one circle and three annuli – that were used to extract the source spectrum. Lower panel: results of the spatially-resolved spectral analysis, showing the spectral index and flux as a function of the distance from HESS J1702-420A.
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