tbl-vspace - vertical spacing around tables normal text before table

table without box

normal text after table without box

table with box

at least one vertical space is required here
or groff will clobber the box
normal text after table with box

table with double box

at least two vertical spaces are required here
or groff will clobber the box
normal text after table with double box

table without box

table with box

table with double box

table without box