Access to this item has been restricted by repository administrators at the request of the publisher, Springer, until August 18, 2016.
This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Springer and can be found at: http://link.springer.com/journal/13524
The publisher's version of this article contains an error in Figure 4b, the map legend. The Erratum to the published version can be found at: http://link.springer.com/article/10.1007%2Fs13524-015-0433-y The author's Accepted Manuscript version is correct as it appears here.
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