About: http://webisa.webdatacommons.org/67053486

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	FIG. 41 is a graph which depicts the measured gray levels versus the thicknesses of the step wedge 1560 at three locations on a circuit board having different background levels.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com