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Keywords:

  • twinning;
  • spreadsheets;
  • refinement;
  • chirality;
  • noncentrosymmetry;
  • inversion;
  • polarity;
  • physical properties;
  • SHELXL;
  • absolute structure

Tables of alphanumeric data concerning crystals twinned by merohedry are presented, assembled into a spreadsheet. The twin table is structured on the 230 space groups and contains the following information: centrosymmetric/chiral indicator, polar axes, twin index, twin operators, some physical property relations, symmetry-related reflections, inversion techniques and a pointer to software use. The software table contains the preceding information translated into command lines for SHELXL [Sheldrick (2008). Acta Cryst. A64, 112–122]. The macromolecular table contains a reduced form of the twin table applicable to enantiomerically pure compounds of known absolute configuration.