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levels = Trait("auto", Int, List)
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# The color(s) of the lines.
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colors = Trait(None, Str, Instance("ColorMapper"), List, Tuple)
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colors = Trait(None, Str, Instance(ColorMapper), List, Tuple)
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# If present, the color mapper for the colorbar to look at.
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# A global alpha value to apply to all the contours
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alpha = Trait(1.0, Range(0.0, 1.0))