(Return link to main list of space groups in standard settings.)
| (a). C 42 / a c m with origin at -4m2 and -1 at 1/4,0,1/4. |
| (b). C 42 / a c m with origin at -1 and -4m2 at 0,1/4,1/4. |
| (c). C 42 / a c m with origin at -1 and -4m2 at 1/4,0,1/4. |
| (d). C 42 / a c m with origin at 42/a and -1 at 1/4,0,0. |