About: http://webisa.webdatacommons.org/65901504

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	This mode requires some other means of modulating the signal, such as chopping the secondary mirror so that the detector alternately views source and background.
http://www.w3.org/ns/prov#wasQuotedFrom	spiedigitallibrary.org