Index: trunk/psphot/src/psphotRadiusChecks.c
===================================================================
--- trunk/psphot/src/psphotRadiusChecks.c	(revision 36086)
+++ trunk/psphot/src/psphotRadiusChecks.c	(revision 36863)
@@ -60,7 +60,7 @@
     if (radiusFit <= 0) {               // use fixed radius
         if (moments == NULL) {
-            radiusFit = model->modelRadius(model->params, PSF_FIT_NSIGMA*moments->dSky);
+            radiusFit = model->class->modelRadius(model->params, PSF_FIT_NSIGMA*moments->dSky);
         } else {
-            radiusFit = model->modelRadius(model->params, 1.0);
+            radiusFit = model->class->modelRadius(model->params, 1.0);
         }
         model->fitRadius = (RADIUS_TYPE)(radiusFit + PSF_FIT_PADDING);
@@ -95,7 +95,7 @@
     if (radiusFit <= 0) {               // use fixed radius
         if (moments == NULL) {
-            radiusFit = model->modelRadius(model->params, PSF_FIT_NSIGMA*moments->dSky);
+            radiusFit = model->class->modelRadius(model->params, PSF_FIT_NSIGMA*moments->dSky);
         } else {
-            radiusFit = model->modelRadius(model->params, 1.0);
+            radiusFit = model->class->modelRadius(model->params, 1.0);
         }
         model->fitRadius = (RADIUS_TYPE)(radiusFit + PSF_FIT_PADDING);
@@ -294,5 +294,5 @@
     float flux = deep ? EXT_FIT_NSIGMA*EXT_FIT_SKY_SIG : 0.1 * model->params->data.F32[PM_PAR_I0];
 
-    float rawRadius = model->modelRadius (model->params, flux);
+    float rawRadius = model->class->modelRadius (model->params, flux);
     if (isnan(rawRadius)) return false;