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Here, in some (few) learned talks about breathing oxygen, be it
during hyperbaric treatment or loooong deco stops, the concept of
"air break" is mentionned throughout.

One will recall that ye olde apollo spaceships that sailed to the 
moon many moons ago did sport a 1/3 bar 100% oxygen atmosphere for 
the comfort and convenience of their valiant (but cramped) crews.

The question is how did the guys who were cooped-up in those tin cans
for days or weeks cope with the issue of oxygen toxicity? They
certainly could not take air breaks, for this would have reduced the
ppO2 below what normal lungs consider useful. 

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