code: def make_ring_filelist(self, sourcekeys, rings, galprop_run):
          
          flist = []
          for sourcekey in sourcekeys:
              for ring in rings:
                  flist += [self.make_ring_filename(sourcekey,
                                                    ring, galprop_run)]
          return flist
docs: Make a list of all the template files for a merged component
  
          Parameters
          ----------
  
          sourcekeys : list-like of str
              The names of the componenents to merge
          rings : list-like of int
              The indices of the rings to merge
          galprop_run : str
              String identifying the galprop parameters