-v1 Version 1 AT&T UNIX
-v2 Version 2 AT&T UNIX
-v3 Version 3 AT&T UNIX
-v4 Version 4 AT&T UNIX
-v5 Version 5 AT&T UNIX
-v6 Version 6 AT&T UNIX
-v7 Version 7 AT&T UNIX
-32v Version 32V AT&T UNIX
-V AT&T System V UNIX
-V.1 AT&T System V.1 UNIX
-V.2 AT&T System V.2 UNIX
-V.3 AT&T System V.3 UNIX
-V.4 AT&T System V.4 UNIX
+/*
+ * This file defines the AT&T versions of the .At macro. This probably
+ * isn't going to change. The right-hand side is the formatted string.
+ *
+ * Be sure to escape strings.
+ * The non-breaking blanks prevent ending an output line right before
+ * a number. Groff prevent line breaks at the same places.
+ */
+
+LINE("v1", "Version\\~1 AT&T UNIX")
+LINE("v2", "Version\\~2 AT&T UNIX")
+LINE("v3", "Version\\~3 AT&T UNIX")
+LINE("v4", "Version\\~4 AT&T UNIX")
+LINE("v5", "Version\\~5 AT&T UNIX")
+LINE("v6", "Version\\~6 AT&T UNIX")
+LINE("v7", "Version\\~7 AT&T UNIX")
+LINE("32v", "Version\\~32V AT&T UNIX")
+LINE("III", "AT&T System\\~III UNIX")
+LINE("V", "AT&T System\\~V UNIX")
+LINE("V.1", "AT&T System\\~V Release\\~1 UNIX")
+LINE("V.2", "AT&T System\\~V Release\\~2 UNIX")
+LINE("V.3", "AT&T System\\~V Release\\~3 UNIX")
+LINE("V.4", "AT&T System\\~V Release\\~4 UNIX")