code: def download_quad(self, quad, callback=None):
          '''Download the specified mosaic quad. If provided, the callback will
          be invoked asynchronously.  Otherwise it is up to the caller to handle
          the response Body.
  
          :param asset dict: A mosaic quad representation from the API
          :param callback: An optional function to aysnchronsously handle the
                           download. See :py:func:`planet.api.write_to_file`
          :returns: :py:Class:`planet.api.models.Response` containing a
                    :py:Class:`planet.api.models.Body` of the asset.
          :raises planet.api.exceptions.APIException: On API error.
          '''
          download_url = quad['_links']['download']
          return self._get(download_url, models.Body, callback=callbackf download_quad(self, quad, callback=None):
          '''Download the specified mosaic quad. If provided, the callback will
          be invoked asynchronously.  Otherwise it is up to the caller to handle
          the response Body.
  
          :param asset dict: A mosaic quad representation from the API
          :param callback: An optional function to aysnchronsously handle the
                           download. See :py:func:`planet.api.write_to_file`
          :returns: :py:Class:`planet.api.models.Response` containing a
                    :py:Class:`planet.api.models.Body` of the asset.
          :raises planet.api.exceptions.APIException: On API error.
          '''
          download_url = quad['_links']['download']
          return self._get(download_url, models.Body, callback=callback)
docs: Download the specified mosaic quad. If provided, the callback will
          be invoked asynchronously.  Otherwise it is up to the caller to handle
          the response Body.
  
          :param asset dict: A mosaic quad representation from the API
          :param callback: An optional function to aysnchronsously handle the
                           download. See :py:func:`planet.api.write_to_file`
          :returns: :py:Class:`planet.api.models.Response` containing a
                    :py:Class:`planet.api.models.Body` of the asset.
          :raises planet.api.exceptions.APIException: On API error.