> With file1, the text is not vertically centered between the two
> lines.
Correct.
> Specifically, the distance between the top of the text and the top
> line is much smaller than between the bottom of the text and the
> bottom line.
Correct.
> Using old AT&T tbl/troff, the text is properly vertically centented.
I can't believe that. Actually, if this is really the case then there
is a bug somewhere in AT&T, since all three calls to `.vs' in file2
move vertically by a fixed amount which is completely independent of
the actual dimensions of the glyphs in string `GOO'.
If you replace `GOO' with `(((((GOO)))))' you can see that the string
*is* vertically centered. Since `GOO' has no glyphs with descenders,
the space below the string is larger than the space above.
Testing with heirloom troff + tbl, I get the same appearance as with
groff.
Werner
PS: The AT&T snippet you are providing lacks some calls to `.br' --
`.vs' doesn't cause a line break.
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