-Successful commands have responses of
-.IP
-.BI A number \en
-.PP
-where
-.I number
-is an ASCII representation of a decimal number.
-Unsuccessful commands are responded to with
-.PP
-.IP
-.BI E error-number \en error-message \en
-.PP
-where
-.I error-number
+Successful commands have responses of:
+.Bd -filled -offset indent
+.Sm off
+.Sy A Ar number No \en
+.Sm on
+.Ed
+.Pp
+.Ar Number
+is an
+.Tn ASCII
+representation of a decimal number.
+Unsuccessful commands are responded to with:
+.Bd -filled -offset indent
+.Sm off
+.Xo Sy E Ar error-number
+.No \en Ar error-message
+.No \en
+.Xc
+.Sm on
+.Ed
+.Pp
+.Ar Error-number