What type of plot to include on the diagonal, options are
'acf' which plots the autocorrelation function acf, 'hist'
shows marginal posterior histograms, and 'trace' the trace plot.
acf.ylim
If using the acf function on the diagonal, specify the y
limit. The default is c(-1,1).
ymult
A vector of length ncol(posterior) specifying how much room
to give when using the hist option for the diagonal. For use if the
label is blocking part of the plot. The default is 1.3 for all
parameters.
axis.col
Color of axes
pars
A vector of parameter names or integers representing which
parameters to subset. Useful if the model has a larger number of
parameters and you just want to show a few key ones.
label.cex
Control size of labels
limits
A list containing the ranges for each parameter to use in
plotting.
...
Arguments to be passed to plot call in lower diagonal panels