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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)[link]] and the supercentered setting [[{\bf A}_1], [{\bf A}_2 = {\bf a}{'}_2]; dashed lines; see equation (41)[link]].

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