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\author{Chet Chet  Hopp\footnote{\label{note1}Victoria Univerisity of Wellington, SGEES, PO Box 600, Wellington 6140} \and Martha Savage\footnotemark[1] \and John Townend\footnotemark[1], Steve Sherburn\footnote{GNS Science, Wairakei, Private Bag 2000, Taupo 3352}} 3352}