<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div>Dear Herbert, </div><div> thank you for your help, but I have a problem with \axesIIID, too. When I draw a solid, or a plane like codes before, I need to outline several parts of a certain axis. For example, in a 3d graph, z-axis should be hidden in a certain interval of numeber and visible in others. Is it possible to do this or not? </div><div><br></div><div>Thank you</div><div><br></div><div>Carlo</div></div></body></html>