\item{xlab}{a character string (or a variable of mode character)
giving the label for the x-axis (default is "Time").}
\item{ylab}{idem for the y-axis (default is "N").}
- \item{...}{in the cases of \code{ltt.plot()} and \code{ltt.lines()}
+ \item{\dots}{in the cases of \code{ltt.plot()} and \code{ltt.lines()}
these are further (graphical) arguments to be passed to
\code{plot()} or \code{lines()}, respectively (see \code{Details:}
on how to transform the axes); in the case \code{mltt.plot()} these