def METHOD_NAME(self):
    """
    Loop over the complete index and dump it on the screen.
    """
    indices = self._root_file.Get("Indices")
    if args.debug:
        print("## DEBUG ##:")
        print("Run,\tLumi,\tType,\t\tFirstIndex,\tLastIndex")
        for i in range(indices.GetEntries()):
            indices.GetEntry(i)
            print('{0:4d}\t{1:4d}\t{2:4d}({3:s})\t\t{4:4d}\t{5:4d}'.format(
                indices.Run, indices.Lumi, indices.Type, 
                DQMIO.types[indices.Type], indices.FirstIndex, indices.LastIndex))
    for i in range(indices.GetEntries()):
        indices.GetEntry(i)
        if indices.Type < len(DQMIO.types):
            self.write_to_file(self.types[indices.Type],
                [indices.FirstIndex,indices.LastIndex], str(indices.Run))
        else:
            print("Unknown histogram type. Type numer: %s" % (indices.Type))
    self.f.Close()