def _rm_get_remaining_genomic_from_header(parts):
return int(parts[<NUM_LIT:7>][<NUM_LIT:1>:-<NUM_LIT:1>])<EOL>
get the remaining number of bases that are on the genomic sequence after
the match from the header line of a repeatmasker alignment. 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 remaining genomic bases are always at position 7 (zero-based index)