diff --git a/src/Gui/SolveCPDialog.cpp b/src/Gui/SolveCPDialog.cpp
index c388a47ce..f189b4b67 100644
--- a/src/Gui/SolveCPDialog.cpp
+++ b/src/Gui/SolveCPDialog.cpp
@@ -378,7 +378,7 @@ SolveCPDialog::current(int k,WBParms p,double sum)
     else csumLabel->setText(QString("%1").arg(sum, 0, 'f', 3));
 
     // visualise new point
-    solverDisplay->addPoint(SolverPoint(p.CP, p.W, sum));
+    solverDisplay->addPoint(SolverPoint(p.CP, p.W, sum, p.TAU));
 
     if (!(k++%200) || k == 99999)  QApplication::processEvents();
 }
diff --git a/src/Gui/SolverDisplay.cpp b/src/Gui/SolverDisplay.cpp
index 175344980..3d0097795 100644
--- a/src/Gui/SolverDisplay.cpp
+++ b/src/Gui/SolverDisplay.cpp
@@ -84,7 +84,17 @@ SolverDisplay::paintEvent(QPaintEvent *)
         case 0:  { bcolor = QColor(0xed,0xf8,0xe9); size = 1; } break;
         case 1:  { bcolor = QColor(0xba,0xe4,0xb3); size = 2; } break;
         case 2:  { bcolor = QColor(0x74,0xc4,0x76); size = 3; } break;
-        case 3:  { bcolor = QColor(0x23,0x8b,0x45); size = 5; } break;
+        case 3:  {
+                    if (p.t < 80) bcolor=QColor(255,0,0); // diff low
+                    else if (p.t < 150) bcolor = QColor(0x23,0x8b,0x45); // diff mid
+                    else if (p.t < 300) bcolor = QColor(0,0,255); // diff high
+                    else if (p.t < 433)  bcolor=QColor(255,0,0); // integral low
+                    else if (p.t < 566) bcolor = QColor(0x23,0x8b,0x45); // integral mid
+                    else if (p.t <= 700) bcolor = QColor(0,0,255); // integral high
+
+                    size=5;
+                 }
+                 break;
         }
 
         painter.setBrush(bcolor);
diff --git a/src/Gui/SolverDisplay.h b/src/Gui/SolverDisplay.h
index 7bacf1c0f..1cb525092 100644
--- a/src/Gui/SolverDisplay.h
+++ b/src/Gui/SolverDisplay.h
@@ -31,9 +31,10 @@
 
 struct SolverPoint {
     public:
-    SolverPoint(int x, int y, double z) : x(x), y(y), z(z) {}
+    SolverPoint(int x, int y, double z, int t) : x(x), y(y), z(z), t(t) {}
     int x,y;
     double z;
+    int t;
 };
 
 class SolverDisplay : public QWidget