\eqn{\delta}{delta} plot (the default).}
\item{which}{a numeric vector indicating which plots are done; 1: the
histogram of the \eqn{\delta_q}{delta_q} values, 2: the plot of the
\eqn{\delta}{delta} plot (the default).}
\item{which}{a numeric vector indicating which plots are done; 1: the
histogram of the \eqn{\delta_q}{delta_q} values, 2: the plot of the