!ppl axlabp -1,1

! ok
def axis/z=10:10000:10 myzaxis
plot/vlog z[gz=myzaxis]

pause

! not ok : left vertical log axis is down. right vertical axis is up
def axis/z=10:10000:10/depth myzaxis
plot/vlog z[gz=myzaxis]

frame/file=err630_plotlog.gif