diff --git a/Fltk/GUI.cpp b/Fltk/GUI.cpp
index 730b8c502b09f5974a8acd2948dc3b375d57dd42..ddd00f87efafcbcf23601301be841cf507939de4 100644
--- a/Fltk/GUI.cpp
+++ b/Fltk/GUI.cpp
@@ -1,4 +1,4 @@
-// $Id: GUI.cpp,v 1.654 2008-02-17 08:47:57 geuzaine Exp $
+// $Id: GUI.cpp,v 1.655 2008-02-17 10:17:02 geuzaine Exp $
 //
 // Copyright (C) 1997-2008 C. Geuzaine, J.-F. Remacle
 //
@@ -3859,7 +3859,7 @@ void GUI::create_statistics_window()
       stat_value[num++] = new Fl_Output(2 * WB, 2 * WB + 12 * BH, IW, BH, "Time for 3D mesh");
 
       stat_value[num] = new Fl_Output(2 * WB, 2 * WB + 13 * BH, IW, BH, "Gamma"); 
-      stat_value[num]->tooltip("~ volume / sum_face_area / max_edge_length"); num++;
+      stat_value[num]->tooltip("~ inscribed_radius / circumscribed_radius"); num++;
       stat_value[num] = new Fl_Output(2 * WB, 2 * WB + 14 * BH, IW, BH, "Eta");
       stat_value[num]->tooltip("~ volume^(2/3) / sum_edge_length^2"); num++;
       stat_value[num] = new Fl_Output(2 * WB, 2 * WB + 15 * BH, IW, BH, "Rho");
diff --git a/doc/FAQ b/doc/FAQ
index 6b4a983a16104c30656e5e098e5fe3cff8459e67..0e553b18fa8923b858d7beeb6060de2c654cb0c3 100644
--- a/doc/FAQ
+++ b/doc/FAQ
@@ -1,4 +1,4 @@
-$Id: FAQ,v 1.82 2007-07-23 19:28:13 geuzaine Exp $
+$Id: FAQ,v 1.83 2008-02-17 10:17:02 geuzaine Exp $
 
 This is the Gmsh FAQ
 
@@ -263,9 +263,9 @@ Tools->Statistics?
 
 They measure the quality of the tetrahedra in a mesh:
 
-Rho ~ min_edge_length / max_edge_length
+Gamma ~ inscribed_radius / circumscribed_radius
 Eta ~ volume^(2/3) / sum_edge_length^2
-Gamma ~ volume / sum_face_area / max_edge_length 
+Rho ~ min_edge_length / max_edge_length
 
 For the exact definitions, see Geo/MElement.cpp. The graphs plot the
 the number of elements vs the quality measure.