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tokens: The authors are grateful to the referee, whose detailed and constructive comments greatly improved the manuscript. We would also like to thank P. Bonfini and T. Bitsakis for many useful discussions and comments on this work. This research made use of MONTAGE . It is funded by the National Science Foundation under Grant Number ACI-1440620, and was previously funded by the National Aeronautics and Space Administration’s Earth Science Technology Office, Computation Technologies Project, under Cooperative Agreement Number NCC5-626 between NASA and the California Institute of Technology. M. V. was supported by an IKY postdoctoral Scholarship.