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...e number of tick marks in the x axis. My x axis are month and I want to reduce the 12 tick marks to 4. I used the scales argument but it doesn't seem to work, althougth it works on y axis if I use scales=list(tick.number=4). xyplot(land~mes|porto+arte,data=hom.land.mpa[hom.land.mpa$arte!="pseine",],type="l",scales=list(x=list(tick.number=4))) Regards EJ -- Ernesto Jardim <ernesto at ipimar.pt> Marine Biologist IPIMAR, Lisboa, Portugal SuSE Linux 8.1;R 1.7.0;LyX 1.3.2;Gnome 2.2.2;OO1.1Beta