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TeV gamma rays from the blazar Markarian 501 have been detected with theUniversity of Durham Mark 6 atmospheric Cerenkov telescope using the imagingtechnique at large zenith angles. Observations were made at zenith angles inthe range 70 - 73 deg during 1997 July and August when Markarian 501 wasundergoing a prolonged and strong flare.Comment: 7 pages, 2 figures, accepted for publication in J. Phys. G.: Nucl.  Part. Phy

Observations of TeV gamma rays from Markarian 501 at large zenith angles