Magnetic diffraction Systematic Absences for the group Pnnm' (#58.396) For this space group, BNS and OG settings coincide. Its label in the OG setting is given as: Pnnm' (#58.4.474)
Values of h, k, l:  h integer, k integer, l integer
Systematic absences for special reflections:
Diffraction vector type: (0 0 l) -> Systematic absence: l any