This should be an easy one...

If Dan at dagsites.com is amenable, it would be useful to add a new FAQ labeled "Emissions Diagrams," and simply link his emissions page.

http://www.dagsites.com/emissions.htm

His great color chart tool is already linked from another FAQ, so this would be more good stuff from his site.
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67 Caribe 1600
76 Ceylon 2002