(Return link to main list of space groups in standard settings.)
| (a). P 4 / n m m with origin at -4m2. |
| (b). P 4 / n m m with origin at 2/m and 4mm at 1/4,1/4,z. |
| (c). P 4 / n m m with origin at 2/m and -4m2 at 1/4,1/4,0. |
| (d). P 4 / n m m with origin at 4mm and 2/m at 1/4,1/4,0. |