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When Org exports tables, it does so by default without vertical lines because
that is visually more satisfying in general. Occasionally however, vertical
lines can be useful to structure a table into groups of columns, much like
horizontal lines can do for groups of rows. In order to specify column
groups, you can use a special row where the first field contains only
‘`/`’. The further fields can either contain ‘`<`’ to indicate that
this column should start a group, ‘`>`’ to indicate the end of a group, or
‘`<>`’ (no space between ‘`<`’ and ‘`>`’) to make a column a group
of its own. Boundaries between column groups will upon export be marked with
vertical lines. Here is an example:

| N | N^2 | N^3 | N^4 | ~sqrt(n)~ | ~sqrt[4](N)~ | |---+-----+-----+-----+-----------+--------------| | / | < | | > | < | > | | 1 | 1 | 1 | 1 | 1 | 1 | | 2 | 4 | 8 | 16 | 1.4142 | 1.1892 | | 3 | 9 | 27 | 81 | 1.7321 | 1.3161 | |---+-----+-----+-----+-----------+--------------| #+TBLFM: $2=$1^2::$3=$1^3::$4=$1^4::$5=sqrt($1)::$6=sqrt(sqrt(($1)))

It is also sufficient to just insert the column group starters after every vertical line you would like to have:

| N | N^2 | N^3 | N^4 | sqrt(n) | sqrt[4](N) | |----+-----+-----+-----+---------+------------| | / | < | | | < | |