Index: trunk/archive/pslib/include/psPhotom.h
===================================================================
--- trunk/archive/pslib/include/psPhotom.h	(revision 344)
+++ trunk/archive/pslib/include/psPhotom.h	(revision 622)
@@ -15,9 +15,9 @@
 /** photometry system definition */
 typedef struct {
-    int ID;				///< ID number for this photometric system
-    char *name;				///< Name of photometric system
-    char *camera;			///< Camera for photometric system
-    char *filter;			///< Filter used for photometric system
-    char *detector;			///< Detector used for photometric system
+    const int ID;			///< ID number for this photometric system
+    const char *name;			///< Name of photometric system
+    const char *camera;			///< Camera for photometric system
+    const char *filter;			///< Filter used for photometric system
+    const char *detector;		///< Detector used for photometric system
 } psPhotSystem;