Add a time series to an existing xts plot
addSeries(x, main = "", on = NA, type = "l", col = NULL, lty = 1,
lwd = 1, pch = 1, ...)an xts object to plot.
main title for a new panel if drawn.
panel number to draw on. A new panel will be drawn if on=NA.
the type of plot to be drawn, same as in plot.
color palette to use, set by default to rational choices.
set the line type, same as in par.
set the line width, same as in par.
the type of plot to be drawn, same as in par.
any other passthrough graphical parameters.
Ross Bennett