\item{edge}{a vector of mode numeric giving the numbers of the edges
where the text or the symbols are to be printed. Can be left empty.}
\item{adj}{one or two numeric values specifying the horizontal and
- vertical, respectively, justification of the text. By default, the
- text is centered horizontally and vertically. If a single value is
- given, this alters only the horizontal position of the text.}
+ vertical, respectively, justification of the text or symbols. By
+ default, the text is centered horizontally and vertically. If a
+ single value is given, this alters only the horizontal position of
+ the text.}
\item{frame}{a character string specifying the kind of frame to be
printed around the text. This must be one of "rect" (the default),
"circle", "none", or any unambiguous abbreviation of these.}