> I agree. Air is not useful for ANY of these deco's where the PPO2 is high
enough
> to do any good 

High PO2 is not specifically what you're after on deco (although it may
help in a variety of subtle ways).  What you're really after is low PP
inert.  More to the point, what you're after is a gas mixture that has a
low partial pressure of the gas that's dissolved in large quantities in
your body.  People tend to think in terms of highPO2 = good deco gas
because of the O2 per se, but this is just because O2 is regarded as a
"freebie" gas from a decompression point of view.  I guess my point is
that air at your deep decompression stops is just as good as an "ideal"
nitrox, if you're coming off a very high helium-content dive (like
heliox).

Sorry for the nit-pick, but I just wanted to respond to the notion that 
the PO2 must be high before a decompression gas will "do any good".

Aloha,
Rich

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