ODM2 Speciation Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of SpatialOffset that exists between two SamplingFeatures. C18H12 Expressed as C18H12, e.g., benz(a)anthracene, chrysene, triphenylene Adapted from the CUAHSI HIS SpeciationCV. See: http://his.cuahsi.org/mastercvreg/edit_cv11.aspx?tbl=SpeciationCV.