plotting streamlines from stream2

2016 11 5
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A simple reading of the help files suggests that this will work.
[Gx, Gy] = imgradientxy(uint8(filteredreducedSection), 'CentralDifference');
figure (4)
XY = stream2(Gx,Gy,X,Y);
streamline(XY)
But I just get a blank grid. I know that Gx and Gy are created because I can create a quiver plot from them. thoughts?

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