thanks for your answer, Rene. This is what I need. But my figure is supposed to be published, so it must be polished. There are still 2 problems :
labels that do not appear on the canvas do appear on the postscript :
/afs/cern.ch/user/c/cbernet/public/zones.ps was created with zones.C
for contiguous pads, labels overlap at the border, which can be seen on the canvas after executing zones.C . Is there any option specifying TGaxis not to paint the last label ? this would solve the problem.
This problem (labels not visible on the screen but visible on the PS file) has been fixed 2 days ago. It is now in CVS. A work around with the ROOT version you have, is to specify a very small label size.
There no nay to not paint the last label with TGaxis. May be playing with the number of divisions or/and with the axis limits can solve the problem. For instance, instead of finishing your axis at 1. exacty you can try to finish it at 0.9999… just a guess …