0 2 0 http://purl.obolibrary.org/obo/UO_0010069 bar 'bar' EquivalentTo {'bar'} 'bar' SubClassOf 'pascal based unit' http://purl.obolibrary.org/obo/UO_0010071 microgram per square centimeter 'microgram per square centimeter' SubClassOf 'area density unit'