[Groff] eqn and ms question

[Michael Hobgood]

Question:
        Earlier, I reported that the -ms package appeared
not to work with the mark and lineup eqn commands.
I never got a response, and just dropped it.  However,
when doing chapter 9 of the UTP, it had the following
example code:

.EQ I
mu~mark =~lambda t
.EN
.EQ I
lineup =~int from 0 to t lambda dz
.EN

When processed using the utp macros via the command:
groff -e -ms
the output lines up.  However, if I take this snippet
of code, and do not include the utp macros at the top,
i.e
.so utp.mac
.utp
then the equations don't line up under each other, but
rather keep going across the page.

Anyone have some clues as to what is going on?

Thanks
Michael Hobgood