The coordinate along the E-W (columns) or SW-NE (rows) axis. Equal to the offset column coordinate if column orientation.
The coordinate along the NE-SW (columns) or N-S (rows) axis. Equal to the offset row coordinate if row orientation.
The coordinate along the SE-NW axis.
The coordinate along the E-W (columns) or SW-NE (rows) axis. Equal to the offset column coordinate if column orientation.