EBL effect on the observation of multi-TeV flaring of 2009 from Markarian 501 Sarira Sahu, Marco Vladimir Lemus Yáñez, Luis Salvador Miranda, Alberto Rosales de León and Virendra Gupta Eur. Phys. J. C, 77 1 (2017) 18 Published online: 10 January 2017 DOI: 10.1140/epjc/s10052-016-4592-9