[Groff] table column widths

[Brian McGurk]

Hi,

Is it possible to specify column widths in a table as a proportion of
the linewidth? I've tried using the line width register to calculate a
width for a column:
lw(\n.H/3u)lw(2*\n.H/3u)
but I've no experience of groff and, not surprisingly, that didn't
work.

Any help would be greatly appreciated. I'm not subscribed to the list
so if anyone has any suggestions, could you please mail me directly?

Thanks,

Brian McGurk