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From: lapoint@BRL.ARPA
Newsgroups: comp.unix.questions
Subject: Re:  troff question
Message-ID: <10227@brl-adm.ARPA>
Date: Sun, 8-Nov-87 16:59:15 EST
Article-I.D.: brl-adm.10227
Posted: Sun Nov  8 16:59:15 1987
Date-Received: Tue, 10-Nov-87 02:54:24 EST
Sender: news@brl-adm.ARPA
Lines: 3

suffix backslash to the if line
and
prefix . to the block if terminator line.