Index: trunk/psModules/src/objects/pmModelFuncs.h
===================================================================
--- trunk/psModules/src/objects/pmModelFuncs.h	(revision 34085)
+++ trunk/psModules/src/objects/pmModelFuncs.h	(revision 34259)
@@ -81,4 +81,9 @@
 #define PM_PAR_8    8   ///< Model-dependent parameter
 
+// these are used by pmModel_TRAIL, with refers to L and Theta explicitly
+#define PM_PAR_LENGTH 4 ///< trail length
+#define PM_PAR_THETA  5 ///< position angle
+#define PM_PAR_SIGMA  6 ///< position angle
+
 /*** these prototype classes are used to define elements of the pmModelClass structure below ***/