--- trunk/tcProps/readWrite.c	2004/03/05 03:09:26	1084
+++ trunk/tcProps/readWrite.c	2004/03/05 03:10:29	1085
@@ -631,5 +631,39 @@ double scanSmallestZ(int startFrame){
 
   return smallest;
 }
+  
+double calcAverageXY( double startTime ){
   
+  int i, count, startFrame, startFound;
+  double avg;
+
+  startFound = 0;
+  startFrame = -1;
+  while( !startFound ){
+
+    startFrame++;
+
+    if(startFrame >= nFrames){
       
+      fprintf( stderr,
+	       "Start Time, %G, was not found in the dump file.\n",
+	       startTime );
+      exit(0);
+    }
+    
+    if(startTime <= frameTimes[startFrame])
+      startFound = 1;
+
+
+  }
+
+  avg = 0.0;
+  count = 0;
+  for(i=startFrame;i<nFrames;i++){
+    avg += posArray[i].Hmat[0][0] * posArray[i].Hmat[1][1];
+    count++;
+  }
+  avg /= (double)count;
+
+  return avg;
+}