\item{col.Q}{(optional) [character] vector of 2 colors codes or names for observed and simulated flows, respectively (these can be of the form \code{"#AABBCC"} or \code{"rgb(255, 100, 200)"} or \code{"yellow"}), see \code{\link{par}} and \code{\link{rgb}}}
\item{xlab}{(optional) [character] a label for the xaxis}
\item{xlab}{(optional) [character] a label for the x-axis}
\item{ylab}{(optional) [character] a label for the yaxis (flow and precipitation)}
\item{ylab}{(optional) [character] a label for the y-axis (flow and precipitation)}
\item{main}{(optional) [character] a main title for the plot}