docs: def _rm_get_reference_coords_from_header(parts):
    """
    extract the reference (genomic sequence match) coordinates of a repeat
    occurrence from a repeatmakser header line. An example header line is::
  
      239 29.42 1.92 0.97 chr1 11 17 (41) C XX#YY (74) 104 1 m_b1s502i1 4
  
    the genomic start and end are always at positions 5 and 6 resepctively. In
    the repeatmasker format, the end is inclusive, but in pyokit end coordinates
    are exclusive, so we adjust it when we parse here.
  
    :param parts: the header line, as a tokenized list.
    :return: tuple of (start, end)
    """
    s = int(parts[5])
    e = int(parts[6]) + 1
    if (s >= e):
      raise AlignmentIteratorError("invalid repeatmakser header: " +
                                   " ".join(parts))
    return (s, e)