>Tom wrote: >The new Halcyon follow up to the odessey maintains a 2% of the supply >gas regardless of depth or ascent /descent rates. Are you saying that if the supply is 32% O2 then the inspired gas will be 30% O2? Or are you saying that if the supply gas is 32% O2 then the inspired gas will be +-2% of some number (probably around 21% O2 )? Where does this number come from? Did you measure it under a variety of metabolic/depth conditions for different people or is this the number quoted by the manufacturer? Barrie
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