International
Tables for Crystallography Volume A Spacegroup symmetry Edited by M. I. Aroyo © International Union of Crystallography 2015 
International Tables for Crystallography (2015). Vol. A, ch. 1.4, p. 50


Figure 1.4.2.1
Generalposition and symmetryoperations blocks for the space group , No. 14 (unique axis b, cell choice 1). The coordinate triplets of the general position, numbered from (1) to (4), correspond to the four coset representatives of the decomposition of with respect to its translation subgroup, cf. Table 1.4.2.6. The entries of the symmetryoperations block numbered from (1) to (4) describe geometrically the symmetry operations represented by the four coordinate triplets of the generalposition block. 