[Groff] change spacing for .tc request

[Ralph Graulich]

Hi,

what's the best and most compatible solution to change the character
spacing for a .tc requested filler?

For example, I want to fill the remainder of a table cell with dots, so I
define:

.ta 2.7cR
.tc .
Text <TAB>

and it gets printed as:

Text ......... (up to 2.7c)

I'd like to have a en-space inserted between each dot, so it gets
optically more light-weight:

Text . . . . . . (up to 2.7c)


Kind regards
... Ralph ...