integer. Defines the number of lags to be displayed. The default
is 10 * log10(length(series)).
main
an overall title for the plot
cex
numerical value giving the amount by which plotting text and symbols should be magnified relative to the default.
type
character string giving the type of acf to be computed. Allowed values are "cor" (the default), "cov" or "part" for autocorrelation, covariance or partial correlation.
PlotACF plots a combination of the time series and its autocorrelation and partial autocorrelation. PlotGACF is used as
subfunction to produce the acf- and pacf-plots.