Index: trunk/psastro/src/psastroMosaicAstrom.c
===================================================================
--- trunk/psastro/src/psastroMosaicAstrom.c	(revision 10438)
+++ trunk/psastro/src/psastroMosaicAstrom.c	(revision 10613)
@@ -28,8 +28,8 @@
 
     // XXX no input distortion model yet; existing fpa distortion is identity: replace it
-    psFree (fpa->toTangentPlane);
-    psFree (fpa->fromTangentPlane);
-    fpa->toTangentPlane   = psPlaneDistortIdentity (order);
-    fpa->fromTangentPlane = psPlaneDistortIdentity (order);
+    psFree (fpa->toTPA);
+    psFree (fpa->fromTPA);
+    fpa->toTPA   = psPlaneDistortIdentity (order);
+    fpa->fromTPA = psPlaneDistortIdentity (order);
 
     grads = psastroMosaicGetGrads (fpa, recipe);