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   Navy just finished a big study on this, Jon. The 
comparisons showed that the operative factor is
the oxygen window at this stage of the deco. Also,
keep in mind that the larger molecule is as hard
to get out as it is to get in. The main reason to
use air from trimix is not the gas differential so much
as it is the only way to "deliver" the O2 without
adding more of the same gas. In the shallow deco,
the "window" displaces the nitrogen and offsets
this effect. While it would seem that introducing
multiple gasses into the equation would reduce the
deco, the operative factor is the total PP of inerts,
considering their own values, not the maximum of one
gas. This is a legitimate question that you have asked,
and I wish it worked, because anything that reduces
deco without increased oxygen exposure would
help reduce what I see as the primary risk of  deco
diving, which is the tox. Thanks, George Irvine.

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