1) A daft of the paper to be published in the Special Issue of Acta Cryst B on MAgnetic structures, introducing webSARAh is available from the PAPERS/DOCUMENTS menu: http://fermat.chem.ucl.ac.uk/spaces/willsgroup/magnetic-structures/2025-sarah-webrepresentational-analysis/ 2) An error in the calculation of the polynomial invariants for k<>0 has been fixed. Thank you Dmitry.