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    Manage the callbacks to maintain a list of selected vertices for
    :class:`matplotlib.lines.Line2D`. Derived classes should override
    :meth:`~matplotlib.lines.VertexSelector.process_selected` to do
    something with the picks.

    Here is an example which highlights the selected verts with red
    circles::

        import numpy as np
        import matplotlib.pyplot as plt
        import matplotlib.lines as lines

        class HighlightSelected(lines.VertexSelector):
            def __init__(self, line, fmt='ro', **kwargs):
                lines.VertexSelector.__init__(self, line)
                self.markers, = self.axes.plot([], [], fmt, **kwargs)

            def process_selected(self, ind, xs, ys):
                self.markers.set_data(xs, ys)
                self.canvas.draw()

        fig, ax = plt.subplots()
        x, y = np.random.rand(2, 30)
        line, = ax.plot(x, y, 'bs-', picker=5)

        selector = HighlightSelected(line)
        plt.show()

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