[Groff] `centre' keyword, `u' and `z' specifiers in tbl, \= in items

[Werner LEMBERG]

Can someone please check whether the English spelling `centre' works
as an alternative to the `center' keyword in UNIX tbl also?  GNU tbl
supports both.

Similarly, I need a check whether the `u' and `z' specifiers (which
aren't documented in Lesk's tbl.ps) do exist in UNIX tbl also.  The
current GNU tbl man page doesn't list them as extensions.

  u  Move the corresponding column up one half-line.

  z  Ignore the corresponding column for width-calculation purposes.

Finally, GNU tbl supports not only `\_' (to have a short horizontal
line) but also `\=' to get a short double horizontal line.  Is this
feature also available with UNIX tbl?


   Werner