

   BBaassiicc IInntteerrnnaall PPlloott FFuunnccttiioonn

        plot.xy(xy, type, pch=1, lty="solid", col=par("fg"), bg=NA, cex=1, ...)

   AArrgguummeennttss::

         xy: A four-element list as results from
             `xy.coords(..)'.

       type: 1 character code.

        pch: character or integer code for kind of
             points/lines.

        lty: line type code, see `lines'.

        col: color code or name, see `colors', `palette'.

         bg: background (``fill'') color for open plot symbols.

        cex: character expansion

        ...: further graphical parameters

   DDeessccrriippttiioonn::

        This is the internal function that does the basic plot-
        ting of points and lines.  Usually, one should rather
        use the higher level functions instead and refer to
        their help pages for explanation of the arguments.

   SSeeee AAllssoo::

        `plot', `plot.default', `points', `lines'.

   EExxaammpplleess::

        points.default # just calling "plot.xy(xy.coords(x, y), type = "p", ......)"

