def save(self, path, **kwargs):
        """
        Save the plot to the file at `path`.

        Any keyword arguments are passed to [`matplotlib.pyplot.savefig`][1].

        [1]: http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.savefig
        """
        self.plot if not hasattr(self, '_plot') else None
        self.figure.savefig(path, **kwargs)