Index: trunk/BNC/bncpppclient.cpp
===================================================================
--- trunk/BNC/bncpppclient.cpp	(revision 4147)
+++ trunk/BNC/bncpppclient.cpp	(revision 4148)
@@ -373,5 +373,5 @@
   double dtRao = tt - cc->tRao;
   ColumnVector raoHlp = cc->rao + cc->dotRao * dtRao 
-                      + cc->dotDotRao * dtRao * dtRao;
+                      + 0.5 * cc->dotDotRao * dtRao * dtRao;
 
   if (raoHlp.norm_Frobenius() > 20.0) {