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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 column, 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) | |----+-----+-----+-----+---------+------------| | / | < | | | < | |