code: public int getBlastGapExtension() {
  		String gapCosts = getAlignmentOption(GAPCOSTS);
  		try {
  			String gapExtension = gapCosts.split("\\+")[1];
  			return Integer.parseInt(gapExtension);
  		} catch (Exception e) {
  			return -1;
  		}
  	}
docs: Returns the value for the gap extension parameter (second half of GAPCOSTS parameter)
  
  @return an integer for the value for gap extension used by this search, -1 if not set or not a number