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\acknowledgements  The authors are grateful for useful suggestions from the CBC group of the LIGO--Virgo Science Collaboration, in particular we are grateful to Walter Del Pozzo for useful advice and advice,  Vivien Raymond for helpful discussions. discussions, Simon Stevenson for careful reading and Neil Cornish for beneficial comments.  BF was supported by the Enrico Fermi Institute at the University of Chicago as a McCormick Fellow. This work was supported in part by the Science and Technology Facilities Council. PBG acknowledges NASA grant NNX12AN10G. SV acknowledges the support of the National Science Foundation and the LIGO Laboratory. JV was supported by STFC grant ST/K005014/1. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under cooperative agreement PHY-0757058. 
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