

   SSiimmppllee PPaanneell PPlloott

        panel.smooth(x, y, col, pch, span=2/3, iter=3, ...)

   AArrgguummeennttss::

        x,y: numeric vectors of the same length

    col,pch: numeric or character codes for the color and point
             type; see `par'

       span: smoothing parameter `f' for `lowess', see there.

       iter: number of robustness iterations for `lowess'.

        ...: further arguments to `lines'.

   DDeessccrriippttiioonn::

        An example of a simple useful `panel' function to be
        used as argument in e.g., `coplot' or `pairs'.

   SSeeee AAllssoo::

        `coplot(.)' and `pairs(.)' where `panel.smooth' is typ-
        ically used; `lowess'.

   EExxaammpplleess::

        data(swiss)
        pairs(swiss, panel = panel.smooth, pch = ".")# emphasize the smooths

