docs: def save(self, dest_path):
          r"""Save the plot as a LaTeX file.
  
          The output file can be included (using \input) in your LaTeX document.
          It can also be compiled as a standalone document to generate a
          (cropped) pdf version of the plot.
  
          :param dest_path: path of the file.
  
          """
          self.save_assets(dest_path)
          self.external_filename = 'externalized-%s' % \
                                   os.path.basename(dest_path).replace(' ', '_')
          dest_path = self._add_extension('tex', dest_path)
          with open(dest_path, 'w') as f:
              f.write(self.render())