--- ray/src/rt/ambient.h	1992/07/13 16:17:48	2.2
+++ ray/src/rt/ambient.h	1992/08/10 08:46:38	2.4
@@ -39,3 +39,5 @@ extern double  sumambient(), doambient(), makeambient(
 #define  AVGREFL	0.5	/* assumed average reflectance */
 
 #define  AMBVALSIZ	75	/* number of bytes in portable AMBVAL struct */
+#define  AMBMAGIC	557	/* magic number for ambient value files */
+#define  AMBFMT		"Radiance_ambval"	/* format id string */