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tokens: The authors would like to thank the anonymous referee for constructive criticism, as well as Shane P. O’Sullivan for providing his unpublished rotation measure synthesis data, and S. Ann Mao for providing her newest data set in digital form. The results in this publication have been derived using the NIFTy 4 package ( Selig et al. 2013 ), as well as the HEALPix 5 package ( Górski et al. 2005 ). This research has made use of NASA’s Astrophysics Data System. It was supported by the DFG Forschergruppe 1254 “Magnetisation of Interstellar and Intergalactic Media: The Prospects of Low-Frequency Radio Observations”. T.A. is supported by the Japan Society for the Promotion of Science (JSPS). B.M.G. acknowledges the support of the Australian Research Council through grant FL100100114. Some of the calculations were carried out on the Canada Foundation for Innovation funded CITA Sunnyvale cluster.