Legend information is missing

2015 6 19
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更新时间：2015 6 19
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I'm trying to plot a two y-axis graph as the following:
As you can see there is one plot missing in the legend. There should be a red square like the first one in the middle. I don't know why it is not appearing. All of the red information os the right axis. Below I show a sketch of my code:
For the fill graphs :
[ax p1 p2] = plotyy([Xaxis fliplr(Xaxis)],[Data_11' fliplr(Data_12')],[Xaxis fliplr(Xaxis)],
[Data12' fliplr(Data22_2')],@(X, Y) fill(X, Y, 'c'),
@(X, Y) fill(X, Y, 'r'));
For the lines:
[ax p1 p2] = plotyy([Xaxis' Xaxis'],[Curve11 Curve12],[Xaxis' Xaxis'],[Curve21 Curve22]);
As for the legend:
legend({'CI 95% - V','\overbar{V}',V','CI 95% - U','\overbar{U}',U'})
Matlab prints "Warning: Ignoring extra legend entries.".
Any thoughts?
Thanks!

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