'See `graph_reference.get_subplot_attributes`.'

def _get_subplot_attributes(self):

    if (self._subplot_attributes is None):
        parent_object_names = self._get_parent_object_names()
        subplot_attributes = graph_reference.get_subplot_attributes(self._name, parent_object_names)
        self.__dict__['_subplot_attributes'] = subplot_attributes
    return self._subplot_attributes
