python - Matplotlib.pyplot.contourf: lines, or gaps between polygons? -


i'm trying plot filled contour plot, edge of each polygon white.

i've tried turning them of linewidth=0, linewidths=0,edgecolor=none , few others. i'm beginning think rounding-error type gap between polygons, don't know. appreciated.

here's mean: bottom left , top right, made 

plt.contourf(x,y,s,20,cmap=get_cmap('piyg'),linewidths=0,edgecolor=none)

enter image description here

i upgraded matplotlib 1.1.1rc (which comes ubuntu 12.04)

it looks (same function call) - can see white edges have gone. difference more apparent in vector graphics versions.

enter image description here


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