Save the plot to an image file.

        Args:
            filename: Filename to save to.
            image_format: Format to save to. Defaults to eps.

def save(self, filename, image_format="eps", width=8, height=6):
        """
        Save the plot to an image file.

        Args:
            filename: Filename to save to.
            image_format: Format to save to. Defaults to eps.
        """
        self.get_plot(width, height).savefig(filename, format=image_format)