Acta Cryst. (2019). B75, doi:10.1107/S2052520618018280 Supporting information Volume 75 (2019) Supporting information for article: Electronic criterion for categorizing the chalcogen and halogen bonds: sulfur–iodine interactions in crystals Ekaterina Bartashevich, Svetlana Muhitdinova, Irina Yushina and Vladimir Tsirelson