About: http://webisa.webdatacommons.org/63710660

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	We also needed a way to color-code places where the derivative was undefined, such as sharp points and discontinuities, so we added pink.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com