--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/WstValueTable.java	Wed Jun 26 13:26:43 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/WstValueTable.java	Wed Jun 26 13:33:15 2013 +0200
@@ -12,6 +12,7 @@
 
 import org.dive4elements.river.artifacts.math.Linear;
 import org.dive4elements.river.artifacts.math.Function;
+import org.dive4elements.river.utils.DoubleUtil;
 
 import java.util.Arrays;
 import java.util.ArrayList;
@@ -327,6 +328,8 @@
                 splineQs[i] = wqs;
             }
 
+            DoubleUtil.sortByFirst(splineQs, splineWs);
+
             SplineInterpolator interpolator = new SplineInterpolator();
 
             try {