a logical indicating whether to plot the confidence interval envelop (default TRUE).
show.h0
a logical indicating whether to plot the the line showing the expected
value of Moran's I under the null hypothesis of no phylogenetic autocorrelation (default TRUE).
show.test
a logical indicating whether to plot indicator of significance (default TRUE).
xlab
a label for the x axis.
ylab
a label for the y axis.
main
a main title for the plot
...
other graphical parameters passed to the plot function.