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tokens: LS is grateful for the support from SNSF grant SCOPES IZ73Z0 152581, GNSF grant FR/339/6-350/14. This work was supported in part by DOE grant DEFG 03-99EP41093. NASA's Astrophysics Data System Bibliographic Service and the arXiv e-print service were used for this work. Additionally, we wish to acknowledge gnuplot , a free open-source plotting utility which was used to create all of our figures and perform the function fitting central to this work. We wish to acknowledge the many useful conversations with Bharat Ratra while performing this work. Lastly, we would like to thank the referee for their useful comments.