Index: trunk/BNC/src/rinex/reqcanalyze.cpp
===================================================================
--- trunk/BNC/src/rinex/reqcanalyze.cpp	(revision 6296)
+++ trunk/BNC/src/rinex/reqcanalyze.cpp	(revision 6297)
@@ -658,6 +658,8 @@
       t_plotData&    data  = plotDataMap[prn];
 
-      data._mjdX24 << mjdX24;
-      data._eleDeg << qcSat._eleDeg;
+      if (qcSat._eleSet) {
+        data._mjdX24 << mjdX24;
+        data._eleDeg << qcSat._eleDeg;
+      }
 
       QString frqType1;