Index: trunk/BNC/combination/bnccomb.cpp
===================================================================
--- trunk/BNC/combination/bnccomb.cpp	(revision 3049)
+++ trunk/BNC/combination/bnccomb.cpp	(revision 3050)
@@ -365,5 +365,5 @@
       corr->eph->position(corr->tt.gpsw(), corr->tt.gpssec(), 
                           xc.data(), vv.data());
-
+      xc(4) -= 2.0 * DotProduct(xc.Rows(1,3),vv) / t_CST::c / t_CST::c;
       _sp3->write(resTime.gpsw(), resTime.gpssec(), corr->prn, xc, _append);
     }