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The H.E.S.S. experiment in Namibia is a high-energy gamma-ray telescopesensitive in the energy range from 30 GeV to a several tens of TeV, that usesthe atmospheric Cherenkov technique to detect showers developed within theatmosphere. The elastic lidar, installed on the H.E.S.S. site, allows to reducethe systematic errors related to the atmospheric composition uncertaintiesthanks to the estimation of the extinction profile for the Cherenkov light(300-650 nm). The latter has a direct impact on the reconstructed parameters,such as the photon energy and the source flux. In this paper we report onphysics results obtained on the Crab Nebula spectrum using the lidar profilesobtained at the H.E.S.S. site.

Impact of H.E.S.S. Lidar profiles on Crab Nebula data