

   PPlloottss aa ssuurrffaaccee

        surface(x, gridlist=NA, extrap=F, ...)

   AArrgguummeennttss::

          x: An Splus object

   gridlist: A list with as many components as variables
             describing the surface.  All components should
             have a single value except the two that give the
             grid points for evaluation. If the matrix or data
             frame has column names, these must appear in the
             grid list.

     extrap: Extraplolation beyond the range of the data.

        ...: Method for specific class of data  may have addi-
             tional arguments.

   VVaalluuee::

   SSeeee AAllssoo::

        surface.tps, surface.krig, surface.nnreg, plot.surface,
        grid.list

   EExxaammpplleess::

        tps(ozone$x,ozone$y) -> fit #tps fit to ozone data
        surface(fit) #plots the surface fit to the ozone data

