Index: /branches/eam_branches/ipp-20110505/psModules/src/objects/models/pmModel_PS1_V1.c
===================================================================
--- /branches/eam_branches/ipp-20110505/psModules/src/objects/models/pmModel_PS1_V1.c	(revision 31544)
+++ /branches/eam_branches/ipp-20110505/psModules/src/objects/models/pmModel_PS1_V1.c	(revision 31545)
@@ -288,5 +288,4 @@
     if (PAR[PM_PAR_I0] <= 0) return 1.0;
     if (flux >= PAR[PM_PAR_I0]) return 1.0;
-    if (PAR[PM_PAR_7] == 0.0) return powf(PAR[PM_PAR_I0] / flux - 1.0, 1.0 / ALPHA);
 
     shape.sx  = PAR[PM_PAR_SXX] / M_SQRT2;
@@ -296,4 +295,10 @@
     psEllipseAxes axes = psEllipseShapeToAxes (shape, 20.0);
     psF64 sigma = axes.major;
+
+    // we can solve directly if PAR_7 goes to 0.0
+    if (PAR[PM_PAR_7] == 0.0) { 
+        psF32 z =  powf(PAR[PM_PAR_I0] / flux - 1.0, 1.0 / ALPHA);
+        return ( sigma * sqrt (2.0 * z) );
+    }
 
     psF64 limit = flux / PAR[PM_PAR_I0];
Index: /branches/eam_branches/ipp-20110505/psModules/src/objects/models/pmModel_QGAUSS.c
===================================================================
--- /branches/eam_branches/ipp-20110505/psModules/src/objects/models/pmModel_QGAUSS.c	(revision 31544)
+++ /branches/eam_branches/ipp-20110505/psModules/src/objects/models/pmModel_QGAUSS.c	(revision 31545)
@@ -289,5 +289,6 @@
     if (PAR[PM_PAR_I0] <= 0) return 1.0;
     if (flux >= PAR[PM_PAR_I0]) return 1.0;
-    if (PAR[PM_PAR_7] == 0.0) return powf(PAR[PM_PAR_I0] / flux - 1.0, 1.0 / ALPHA);
+
+    // if (PAR[PM_PAR_7] == 0.0) return powf(PAR[PM_PAR_I0] / flux - 1.0, 1.0 / ALPHA);
 
     shape.sx  = PAR[PM_PAR_SXX] / M_SQRT2;
@@ -297,4 +298,10 @@
     psEllipseAxes axes = psEllipseShapeToAxes (shape, 20.0);
     psF64 sigma = axes.major;
+
+    // we can solve directly if PAR_7 goes to 0.0
+    if (PAR[PM_PAR_7] == 0.0) { 
+        psF32 z =  powf(PAR[PM_PAR_I0] / flux - 1.0, 1.0 / ALPHA);
+        return ( sigma * sqrt (2.0 * z) );
+    }
 
     psF64 limit = flux / PAR[PM_PAR_I0];