Many thanks to anybody that helped me (Martin, Paul, Terry): I was badly in need, and the axis() method has been the best one. It is tricky, anyway. Pity the plot/grid commands are not "intelligent" enough to do the work themselves... Best regards Alessandro -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \ Alessandro Magni / IEN Galileo Ferraris \ c.M.d'Azeglio 42, 10125 Torino (ITALIA) / magni at omega.ien.it \ Fax (39)11-6507611 / Tel (39)11-3919757 \ Homepage at: http://alpha.ien.it/~magni/home.html / ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._