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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	I will leave the nuances of the discussion to others here especially as Ross and E M Smith have turned up who can discuss the key part of your study concerning altitude.
http://www.w3.org/ns/prov#wasQuotedFrom	wattsupwiththat.com