The "PFHxS and related substances" section contains a lot more detail than the PFOS section, as two different definitions are currently being explored for the Stockholm Convention and EU REACH. This is an interesting example where a slight change in the wording of the definition results in a difference of over 100 CIDs (chemicals) in the resulting lists. The Stockholm Convention PFHxS definition defines related compounds as compounds with a C 6 F 13 S(=O)(=O) moiety (596 CIDs in total), whereas the EU REACH definition defines this as C 6 F 13 S (710 CIDs total). Both definitions appear at the top of the PFHxS section, with content breakdowns (indicated by blue arrows, Figure ) to show how these have been compiled.