[gradsusr] How to align plot grid with twin (double) Y axis?

[klo uo]

Hi,

Let me ask with example: I want to plot "t" and "slp" on same graph
plot and and when I do so, horizontal grid lines are messed because
"t" vertical ticks and "slp" vertical ticks aren't automatically
aligned.

====================
set lat xx
set lon xx
set t 1 last

set ylpos 0 l
d t2m-273.16

set ylpos 0 r
d slp/100
====================

Is there easy way to make them aligned so that horizontal grid is same
for both Y axis?