About: http://webisa.webdatacommons.org/8000449

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 masking unit 80 has upper and lower masking members 80aa, 80ab, which are held with vertically space away from each other by such a distance as to set the aspect ratio of an image to be printed at, for example, 2:1.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com