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tokens: We would like to thank K. Abazajian, G. Bertone, A. Geringer-Sameth, M. Lovell, M. Walker, C. Weniger for collaboration, discussion and useful comments. EB acknowledges support by NASA through grant no. NNX123AE77G. The work of DI has been partially supported from the Swiss National Science Foundation grant SCOPE IZ7370-152581, the grant no. F64/42-2015 of the State Fund for Fundamental Research of Ukraine, the Program of Cosmic Research of the National Academy of Sciences of Ukraine, and the State Programme of Implementation of Grid Technology in Ukraine. The Draco dSph observations were performed as a part of AO-14 Very Large Programme obtained with XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.