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I just spent some time debugging an odd problem. Take this code:
x,y = np.arange(-10,10), np.arange(-10,10)
x,y = np.meshgrid(x,y)
z = x**2+y**2
cs = pyplot.contourf(x,y,z,levels=np.arange(50, 220, 20),
cmap=pyplot.cm.jet, extend='both')
cs.cmap.set_under('k')
cb = pyplot.colorbar(cs)