I am using matplotlib in Python 2.7 to plot a filled contour plot. I want to overlay this over an image, so I am using the alpha keyword to make the plot semi-transparent. When I do this, the body of the contours are the correct transparency, but contourf() plots unwanted lines on the boundaries between different levels. I have attempted to eliminate them with the keyword argument linecolor='none', but this has not helped.
Code:
CS = map.contourf(xi, yi, zi, 25, alpha=0.3, linecolor='none')
A link to an image example of the problem; I would like the filled contours to meet without the bright boundary lines:
Any help or insight into this problem is appreciated.
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