code: def make_ring_filename(self, source_name, ring, galprop_run):
          
          format_dict = self.__dict__.copy()
          format_dict['sourcekey'] = self._name_factory.galprop_ringkey(source_name=source_name,
                                                                        ringkey="ring_%i" % ring)
          format_dict['galprop_run'] = galprop_run
          return self._name_factory.galprop_gasmap(**format_dict)
docs: Make the name of a gasmap file for a single ring
  
          Parameters
          ----------
  
          source_name : str
              The galprop component, used to define path to gasmap files
          ring : int
              The ring index
          galprop_run : str
              String identifying the galprop parameters