Index: /trunk/FACT++/gui/BasicGlCamera.cc
===================================================================
--- /trunk/FACT++/gui/BasicGlCamera.cc	(revision 12051)
+++ /trunk/FACT++/gui/BasicGlCamera.cc	(revision 12052)
@@ -361,8 +361,8 @@
     {
         ostringstream str;
-        float min, max, mean, rms, median;
+        float min, max, median;
         min = max = fData[0];
-        mean = 0;
-        rms = 0;
+        double mean = 0;
+        double rms = 0;
         median = 0;
         multiset<double> medianSet;
@@ -377,8 +377,8 @@
             medianSet.insert(fData[i]);
         }
+
         mean /= ACTUAL_NUM_PIXELS;
-        rms /= ACTUAL_NUM_PIXELS;
-        rms = sqrt(rms);
-//        cout << "Size of the set: " << medianSet.size() << endl;
+        rms = sqrt(rms/ACTUAL_NUM_PIXELS - sum * sum);
+
         multiset<double>::iterator it = medianSet.begin();
         for (int i=0;i<(ACTUAL_NUM_PIXELS/2)-1;i++)