About: http://webisa.webdatacommons.org/103127860

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	With optical flats, an uneven interference pattern indicates that the flatness of the test surface is less than that of the reference surface.
http://www.w3.org/ns/prov#wasQuotedFrom	globalspec.com