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ISSN 1466-8858 Volume 17, Preprint 4 submitted 11 January 2014 © 2014 University of Manchester and the authors. This is a preprint of a paper that has been submitted for…

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ISSN 1466-8858 Volume 13, Preprint 34 submitted 5 August 2010 © 2010 University of Manchester and the authors. This is a preprint of a paper that has been submitted for…