Index: /trunk/psphot/src/psphotDiagnosticPlots.c
===================================================================
--- /trunk/psphot/src/psphotDiagnosticPlots.c	(revision 15118)
+++ /trunk/psphot/src/psphotDiagnosticPlots.c	(revision 15119)
@@ -39,8 +39,6 @@
     }
 
-    psStats *stats = psStatsAlloc (PS_STAT_MAX | PS_STAT_MIN | PS_STAT_ROBUST_MEDIAN);
+    psStats *stats = psStatsAlloc (PS_STAT_MAX | PS_STAT_MIN);
     psVectorStats (stats, values, NULL, NULL, 0);
-    float robustMedian = stats->robustMedian;
-    float robustStdev  = stats->robustStdev;
 
     psHistogram *histogram = psHistogramAlloc (stats->min, stats->max, 1000);
@@ -94,6 +92,6 @@
 
     // +/- 10 sigma
-    graphdata.xmin = robustMedian - 10.0*robustStdev;
-    graphdata.xmax = robustMedian + 10.0*robustStdev;
+    graphdata.xmin = mean - 10.0*sigma;
+    graphdata.xmax = mean + 10.0*sigma;
 
     histogram = psHistogramAlloc (graphdata.xmin, graphdata.xmax, 100);