Van Krevelen diagrams are a graphical-statistical method that cross-plots the oxygen:carbon and hydrogen:carbon ratios.
References
* [http://books.google.com/books?id=ztj2aqgh9_4C&pg=PA129&dq=Van+Krevelen+diagram&lr=&as_brr=3&sig=ACfU3U1EemKYLWdzkM1Sr3q61ZhTAcsSXg The chemistry and technology o petroleum]
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