Index: trunk/ppSim/src/ppSimMergeReadouts.c
===================================================================
--- trunk/ppSim/src/ppSimMergeReadouts.c	(revision 18011)
+++ trunk/ppSim/src/ppSimMergeReadouts.c	(revision 21365)
@@ -14,8 +14,8 @@
     if (!inReadout) return true;
 
-    if (!inReadout->weight) {
-      if (!pmReadoutGenerateWeight(inReadout, true)) {
-	psError (PS_ERR_UNKNOWN, false, "trouble creating weight");
-	return false;
+    if (!inReadout->variance) {
+      if (!pmReadoutGenerateVariance(inReadout, true)) {
+        psError (PS_ERR_UNKNOWN, false, "trouble creating variance");
+        return false;
       }
     }
@@ -30,8 +30,8 @@
 
     psImage *inSignal = inReadout->image;
-    psImage *inVariance = inReadout->weight;
+    psImage *inVariance = inReadout->variance;
 
     psImage *outSignal = outReadout->image;
-    psImage *outVariance = outReadout->weight;
+    psImage *outVariance = outReadout->variance;
 
     assert (inSignal->numRows == outSignal->numRows);
@@ -39,8 +39,8 @@
 
     for (int y = 0; y < inSignal->numRows; y++) {
-	for (int x = 0; x < inSignal->numCols; x++) {
-	    outSignal->data.F32[y][x] += inSignal->data.F32[y][x];
-	    outVariance->data.F32[y][x] += inVariance->data.F32[y][x];
-	}
+        for (int x = 0; x < inSignal->numCols; x++) {
+            outSignal->data.F32[y][x] += inSignal->data.F32[y][x];
+            outVariance->data.F32[y][x] += inVariance->data.F32[y][x];
+        }
     }
     return true;