h = findobj(0,'type','axes','Tag','Top');
delete(h)
[ax,hlines(1),hlines(2)]=plotyy([handles.Axes1],x,y{1},x,y{2});
set(ax,'xlim',get(handles.Axes1,'xlim'))
set(ax(1),'xcolor','black')
set(ax(2),'tag','Top','xcolor','black')
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