This format lists, e.g., all elements in row 1, all elements in column 6, etc, with, at the end, both row and column totals for that particular zone; i.e. printing row 1 will give both the total of all elements in row 1 plus the total of all elements in column 1.
As under 10.10.2 more than one matrix can be printed simultaneously but it is not possible to print, say, row 1 from matrix 1 with row 2 from matrix 2. Nor can I think of any reason why you should want to!