\item{x}{[object of class \emph{PrepGR}] see \code{\link{PrepGR}} for details}
\item{type}{[character] the type of plot that should be drawn (see \code{\link{plot}} for details)}
\item{type}{[character] the type of plot that should be drawn (see \code{\link[base]{plot}} for details)}
\item{col.Precip}{(optional) [character]color code or name for precipitation, see \code{\link{par}}}
\item{col.Precip}{(optional) [character]color code or name for precipitation, see \code{\link[graphics]{par}}}
\item{col.Q}{(optional) [character] color code or name for observed flow, see \code{\link{par}}}
\item{col.Q}{(optional) [character] color code or name for observed flow, see \code{\link[graphics]{par}}}
\item{col.na}{(optional) [character] color code or name for missing values, see \code{\link{par}}}
\item{col.na}{(optional) [character] color code or name for missing values, see \code{\link[graphics]{par}}}
\item{xlab}{(optional) [character] a label for the x-axis (see \code{\link{title}})}
\item{xlab}{(optional) [character] a label for the x-axis (see \code{\link[graphics]{title}})}
\item{ylab}{(optional) [character] a label for the y-axis (vector of 1 or 2 values for rainfall and flow respectively; see \code{\link{title}})}
\item{ylab}{(optional) [character] a label for the y-axis (vector of 1 or 2 values for rainfall and flow respectively; see \code{\link[graphics]{title}})}
\item{main}{(optional) [character] a main title for the plot (see \code{\link{title}})}
\item{main}{(optional) [character] a main title for the plot (see \code{\link[graphics]{title}})}
\item{plot.na}{[boolean] boolean indicating if the missing values are plotted on the x-axis}