whether keyword arg *filled* is ``False`` (default) or ``True``.

        Call signature::

            ContourSet(ax, levels, allsegs, [allkinds], **kwargs)

        Parameters
        ----------
        ax : `~.axes.Axes`
            The `~.axes.Axes` object to draw on.

        levels : [level0, level1, ..., leveln]
            A list of floating point numbers indicating the contour
            levels.

        allsegs : [level0segs, level1segs, ...]
            List of all the polygon segments for all the *levels*.
            For contour lines ``len(allsegs) == len(levels)``, and for
            filled contour regions ``len(allsegs) = len(levels)-1``. The lists
            should look like ::

                level0segs = [polygon0, polygon1, ...]
                polygon0 = [[x0, y0], [x1, y1], ...]

        allkinds : [level0kinds, level1kinds, ...], optional
            Optional list of all the polygon vertex kinds (code types), as
            described and used in Path. This is used to allow multiply-
            connected paths such as holes within filled polygons.
            If not ``None``, ``len(allkinds) == len(allsegs)``. The lists
            should look like ::

                level0kinds = [polygon0kinds, ...]
                polygon0kinds = [vertexcode0, vertexcode1, ...]

            If *allkinds* is not ``None``, usually all polygons for a
            particular contour level are grouped together so that
            ``level0segs = [polygon0]`` and ``level0kinds = [polygon0kinds]``.

        **kwargs
            Keyword arguments are as described in the docstring of
            `~.Axes.contour`.
        NFT)