Equivalence of superspace groups

van Smaalen, S.; Campbell, B.J.; Stokes, H.T.

doi:10.1107/S0108767312041657

Acta Crystallographica Section A
Acta Crystallographica
Section A FOUNDATIONS AND ADVANCES

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Figure 2
Projection of the basic structure of NbSe₃. All atoms are in mirror planes. Hatched and open circles are atoms at 0.25 and 0.75 of the projected coordinate, respectively. Small circles are Se; large circles are Nb, with numbers indicating Nb1, Nb2 and Nb3 atoms. Symmetry operators (2₁,00) and (2₁,s0) alternate in the supercentered setting. Unit cells are indicated for the published BSG setting ( $[{\bf a}_1]$ , $[{\bf a}_3]$ ; solid lines), the standard BSG setting [ $[{\bf a}{'}_1 = {\bf a}_3]$ , $[{\bf a}{'}_2]$ ; dashed lines; see equation (37)