def show_2d(points, **kw):
    """Show two-dimensional geometry data.

    The `points` are a tuple of x, y, z values, the extra keyword arguments are
    passed along to the scatter function.

    """
    import matplotlib.pyplot as plt
    plt.scatter(points[0], points[1], **kw)
    plt.xlabel('X')
    plt.ylabel('Y')
