ner_tags: O O O O O O O B-Person I-Person O O O O O O O O O O O O O O O O O O O B-Instrument O O O O O O O B-Person O O O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization
tokens: ACKNOWLEDGEMENTS The authors would like to thank Jim Hinton for useful discussions and help during the production of the paper. The authors would also like to thank the HAWC collaboration for useful discussions. The research of GG was supported by a Grant from the GIF, the German-Israeli Foundation for Scientific Research and Development.