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Chet Hopp\footnote{Victoria Hopp\footnote{\label{note1}Victoria  Univerisity of Wellington}, Martha Savage\footnotemark[1], Savage\footnotemark[\ref{note1}],  John Townend\footnotemark[1], Townend\footnotemark[\ref{note1}],  Steve Sherburn\footnote{GNS Science, Wairakei}