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Variations of the TeV energy spectrum at different flux levels of Mkn 421 observed with the HEGRA system of Cherenkov telescopes
The nearby BL Lacertae (BL Lac) object Markarian 421 (Mkn 421) at a red shift was observed to undergo strong TeV γ-ray outbursts in the observational periods from December 1999 until May 2001. The time averaged flux level in the 1999/2000 season was 10-11 ph cm-2 s-1, whereas in the …