When vertically justifying a table; setting <?tbrivj=1> gives a way of controlling the amount by which to expand a row, by calculating the amount by which the contents of the row need to expand. PTC ALD does this by finding the deepest cell in the row, summing all the VJ for that cell and using these values in addition to <?tbvjmrow> and <?tbvjprow> to dictate how the row itself is expanded when justifying the column containing the table.

Using <?tbrivj>, <?tbrivjb>, <?tbvjmrowb> and <?tbvjprowb> together enables you to ignore the table and row boundaries and justify the content as though the table didn’t exist. This gives a more even spread of the extra space over the page. This is particularly intended for slim tables, when they are being used to simulate columns.