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In a message dated 9/13/2000 4:17:21 PM Eastern Daylight Time, 
swhac@pc*.gu*.ne* writes:

>      1.6 is 1.6 is 1.6 is 1.6 . . . 1.6!  These people that you speak of 
>  that have to use 50%, if they use it at 70 feet they are still facing the 
>  same pO2 they would see if they were to use O2 at 20.

Things aren't that simple.  While the PO2 of 50% at 70 is 1.56, a change
in depth to 75 feet ups it to 1.64, a difference of only .08 and not a big
deal.  The same five foot change in depth on 100% at 20 feet takes
the PO2 from 1.61 to 1.76, a much more significant increase of 1.5.

A similar statement can be made for 80%.
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