About: http://webisa.webdatacommons.org/250519954

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	where P is the grating pitch of the diffraction grating 3, ?? is the wavelength of the laser beam, m is an integer and ??m is the angle of incidence of the laser beam onto the diffraction grating 3.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com