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Not that theres anything wrong with it, it just that in later versions it developed quite a lot since then.
In your case, what you've done to invert ppm is correct
Current version is here
and the document: here
I'd encourage use of the current version, makes it easier to support if we're on the same version.
Hardly... it was ok at the time - but whilst its not in Mikes league, the new one is much better!