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tokens: We thank Seshadri Nadathur, András Kovács and Juan García-Bellido for correspondence and discussion. Some of the results in this Letter were derived using the healpix (Górski et al. 2005 ) package. ABL thanks CNES for financial support through its post-doctoral programme. This work was supported in part by the Kavli Institute for Cosmological Physics at the University of Chicago through grant NSF PHY-1125897 and an endowment from the Kavli Foundation and its founder Fred Kavli. OL acknowledges support from a European Research Council Advanced Grant FP7/291329, which also supported ABL and KN.