plot multiple ellipses
[omega,a,b] = principalComponents(grains); plotEllipse(grains.centroid,a,b,omega,'lineColor','r')
| cxy | 
             center of the ellipse  | 
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| a,b | 
             length of the half axes  | 
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| omega | 
             orientation of the ellipse  | 
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| param,val | Parameters and values that control plotEllipse
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grain2d/plot, grainBoundary/plot, grain2d/principalComponents
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