About: http://webisa.webdatacommons.org/426135547

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	The phase difference therebetween being substantially a quarter wavelength means that when n is a positive integer, the phase difference therebetween is (2n-1)/4 times the wavelength.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com