-Example table
|  ^  Heading 1  ^  Heading 2  ^  Heading 3  ^
^ Heading 1 | Row 1 Col 1    | this cell spans vertically | Row 1 Col 3        |
^ Heading 2 | Row 2 Col 1    | ::: | Row 2 Col 3        |
^ Heading 3 | Row 3 Col 1    | ::: | Row 2 Col 3        |
^ Heading 4 |Left           |  center  |  right|