diff --git a/src/org/hwo/diagram/SimplePlotProvider.java b/src/org/hwo/diagram/SimplePlotProvider.java
index 28a03a6..1fe9d22 100644
--- a/src/org/hwo/diagram/SimplePlotProvider.java
+++ b/src/org/hwo/diagram/SimplePlotProvider.java
@@ -68,7 +68,8 @@ public class SimplePlotProvider implements PlotProvider {
 	}
 	
 	public void setPlot(int plot,Float[] values){
-		this.plots.set(plot, values);
+		Float[] cv = Arrays.copyOf(values, points);
+		this.plots.set(plot, cv);
 	}
 
 }