Wesley Quadros has some good examples (showing exactly how to get "the numbers") on his web page (listed on the "bookmarks" section of this groups Yahoo Group).
There have been a few examples previously posted here eg http://groups.yahoo.com/group/hw-rules/message/6407 (a grazer from David Dunham) and I'm sure there are some on other web pages that I don't recall at the moment (again I think David has some)
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