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tokens: We thanks R. Angulo, C. Hernández-Monteagudo, and O. Hahn for useful discussions. G.H. and R.A, acknowledge support from Spanish Ministerio de Economía and Competitividad (MINECO) through grant number AYA2015-66211-C2-2. U.K. acknowledges support by the Israel Science Foundation (ISF grant No. 1769/15). We acknowledge the use of HEALPix ( Górski et al. 2005 ).