double [][] matrix = new double [width][height];
double max = 0;
for (int i = 0; i < peakList.size (); i++)
{
Mountain m = peakList.get (i);
if (m.meanRT < startTime || m.meanRT > endTime)
continue;
if (m.meanMZ < startMz || m.meanMZ > endMz)
continue;