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tokens: AW acknowledges support by Polish Ministry of Science and Higher Education in Mobility Plus Program and Polish National Science Centre for supporting this work through grant DEC-2011/03/N/ST9/01867. Support from the German Ministry for Education and Research (BMBF) through the Verbundforschung Astroteilchenphysik grant 05A11VH2 is gratefully acknowledged. This research was supported in part by PLGrid Infrastructure.