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//
// 10.01.13
function Out=Ptnw(varargin)
global XMIN XMAX YMIN YMAX
if length(varargin)==0
Out=[XMIN,YMAX];
else
G=varargin(1);
Xm=min(G(:,1));
YM=max(G(:,2));
Out=[Xm,YM];
end;
endfunction
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