dataSet = graphContext.getData().getDataSet(set);
if ( startIndicies[set] == -1 )
range = dataSet.pointIndiciesBetween(graphContext.getTimeFromXPixel(xPixel), graphContext.getTimeFromXPixel(xPixel + 1));
else
range = dataSet.pointIndiciesBetween(graphContext.getTimeFromXPixel(xPixel), graphContext.getTimeFromXPixel(xPixel + 1), startIndicies[set]);
nextIndex = range.first;
while ( nextIndex <= range.second ) {
point = dataSet.elementAt(nextIndex);
if ( summaryPoint > 0 )
point.setValue(point.getValue() * reductionNumerator / summaryPoint);