Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPointString.cs
===================================================================
diff -u -r4185 -r4248
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPointString.cs	(.../GeometryPointString.cs)	(revision 4185)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPointString.cs	(.../GeometryPointString.cs)	(revision 4248)
@@ -89,7 +89,8 @@
     private bool isFrozen;
     private bool hasNaNx;
     private double frozenMaxZ = double.NaN;
-
+    private readonly Routines2D routines2D = new Routines2D();
+    
     // sortedPoints must never be used outside this class. Either the GPS concerned must have sorted points but then they already are 
     // (eg. surfaceline, headline) or they may be unsorted in which case using the sorted list in other classes leads to errors (eg.
     // geometrysurfaces, waternetlines) 
@@ -701,7 +702,7 @@
             double slopeBefore = (calcPoints[i].Z - calcPoints[i - 1].Z) / (calcPoints[i].X - calcPoints[i - 1].X);
             double slopeAfter = (calcPoints[i + 1].Z - calcPoints[i].Z) / (calcPoints[i + 1].X - calcPoints[i].X);
 
-            if (Routines2D.AreEqual(slopeBefore, slopeAfter, slopeTolerance))
+            if (routines2D.AreEqual(slopeBefore, slopeAfter, slopeTolerance))
             {
                 calcPoints.RemoveAt(i);
             }