Preprocessors in `man' pages
----------------------------
If a preprocessor like `gtbl' or `geqn' is needed, it has become
common usage to make the first line of the man page look like this:
.\" WORD
Note the single space character after the double quote. WORD consists
of letters for the needed preprocessors: `e' for `geqn', `r' for
`grefer', `t' for `gtbl'. Modern implementations of the `man' program
read this first line and automatically call the right preprocessor(s).