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        Parameters
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        mouseevent : `matplotlib.backend_bases.MouseEvent`

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        contains : bool
            Whether any values are within the radius.
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            - 'left', 'right', 'bottom', 'top': Fill the marker half at
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            - ``every=[i, j, m, ...]``: only markers at the given indices
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            - ``every=[True, False, True, ...]``: only positions that are True
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    Manage the callbacks to maintain a list of selected vertices for `.Line2D`.
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        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):
                super().__init__(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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        Default "do nothing" implementation of the `process_selected` method.

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