Index: trunk/psModules/src/objects/pmPSF.c
===================================================================
--- trunk/psModules/src/objects/pmPSF.c	(revision 9923)
+++ trunk/psModules/src/objects/pmPSF.c	(revision 10377)
@@ -6,6 +6,6 @@
  *  @author EAM, IfA
  *
- *  @version $Revision: 1.17 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2006-11-09 20:15:47 $
+ *  @version $Revision: 1.18 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2006-12-01 19:26:47 $
  *
  *  Copyright 2004 Maui High Performance Computing Center, University of Hawaii
@@ -225,4 +225,7 @@
 
     double SXY = fit * PS_SQR(1.0 / PS_SQR(SXX) + 1.0 / PS_SQR(SYY));
+
+    assert (!isnan(SXY));
+
     return SXY;
 }