(Return link to main list of space groups in standard settings.)
| (a). C 4 / a with origin at -4 and -1 at 0,1/4,0. |
| (b). C 4 / a with origin at -1 and -4 at 1/4,0,0. |
| (c). C 4 / a with origin at -1 and -4 at 0,1/4,0. |
| (d). C 4 / a with origin at 4/a and -1 at 0,1/4,0. |