Dear All, We are trying to identify affine normalizers' space group from the additional operators, but having difficulties in introducing the arbitrary translations. As an example, suppose that our "base" space group is 25, and the additional operators are: -x,-y,-z x+1/2,y,z x,y+1/2,z x,y,z+t which, combined, defines P1 mmm But we couldn't find a way to introduce "x,y,z+t" while we are "expand_smx"ing the space group with these operators. Any ideas how to do this? With my thanks in advance, Emre -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Emre S. Tasci - http://www.emresururi.com Fisica de la Materia Condensada Facultad de Ciencia y Tecnologia Universidad del Pais Vasco Apartado 644 48080 Bilbao / Spain -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=