Index: /trunk/psModules/src/objects/models/pmModel_QGAUSS.c
===================================================================
--- /trunk/psModules/src/objects/models/pmModel_QGAUSS.c	(revision 10271)
+++ /trunk/psModules/src/objects/models/pmModel_QGAUSS.c	(revision 10272)
@@ -45,5 +45,5 @@
     // XXX use an assert here to force the elliptical parameters to be correctly determined
     // if (z < 0) z = 0;
-    assert (z > 0);
+    assert (z >= 0);
 
     psF32 zp = pow(z,1.25);