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I have been reading in this group how 80/20 is not the gas to use for deco.  
I have also been reading that Decoplanner is great and EAN50 @ 70 ft. and 100 
% oxygen at 20 ft. is the DIR way to go.  In truth I haven't got the 
slightest idea what the "oxygen window" means unless it simply refers to 
using the closest PO2 that is below 1.6 that you can get to.

Now the question I have to ask is that if 80/20 is only used by strokes, why 
is it that on a dive to 200 ft. on 18/35 for 30 minutes, doing a deco using 
EAN 36 @ 110 ft. and EAN 80 @ 30 ft. actually results in a shorter deco than 
EAN50 @ 70 ft. and 100% oxygen @ 20 ft.?

Any explanations why the stroke mix seems to get you out of the water sooner?

K. Russell
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