code: public long computeTotalLines()
  	{		
  		long numLines = 0;
  		
  		try {
  			numLines = this.getNumLines(summary.getRange("", ""));
  		} catch (IOException e) {
  			LOGGER.warning(e.toString());
  			return 0;
  		}
  		
  		long adjustment = getTotalAdjustment();
  		numLines -= (getNumBlocks() - 1);
  		numLines *= this.getCdxLinesPerBlock();
  		numLines += adjustment;
  		return numLines;
  	}
docs: Adjust from shorter blocks, if loaded