About: http://webisa.webdatacommons.org/269040047

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	In particular, the second annular region 103 is doped with impurities such as fluorine such that its refractive index n3(r) gradually decreases from the center of the optical fiber 100 toward the perimeter.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com