Hi, When I want to draw contour lines on top of a filled.contour plot, I can use the plot.axes arg, such as in : filled.contour(volcano, color = terrain.colors, asp = 1, plot.axes=contour(volcano, add=T) ) but then the lines are computed twice. Is it possible to add an option to filled.contour such that the lines are drawn internally when computed in do_filledcontour. The code is in src/main/plot3d.c in the current R-devel. I would like to do it, but I don't understand the internals. Romain -- visit the R Graph Gallery : http://addictedtor.free.fr/graphiques mixmod 1.7 is released : http://www-math.univ-fcomte.fr/mixmod/index.php +---------------------------------------------------------------+ | Romain FRANCOIS - http://francoisromain.free.fr | | Doctorant INRIA Futurs / EDF | +---------------------------------------------------------------+