C2H6O2 Expressed as Ethylene glycol Adapted from the CUAHSI HIS SpeciationCV. See: http://his.cuahsi.org/mastercvreg/edit_cv11.aspx?tbl=SpeciationCV. ODM2 Speciation Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of SpatialOffset that exists between two SamplingFeatures.