macro "Display Area Summary" {
      if (nResults==0)
        exit("Results table is empty");
      totalArea = 0;
      for (i=0; i<nResults; i++) {
          totalArea += getResult("Area", i);
      }
      print("");
      print("Count: "+nResults);
      print("Average: "+totalArea/nResults);
      print("Total: "+totalArea);
 }