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Don, increasing ppo2 deeper would be great, but we need to look at the
big picture here: are doing a simple dive with tiny deep stops. If we
were going longer we would addd in the 120 bottle. This is not the case
here in our example dive. We also do not mishmash deco gases, but
standardize them for the safety of simplicity and repetitive filling,
and we know from experience that the best standard set are 100, 50, 35,
and the gas used at 190 or 240 . 

Mcinnis, Don wrote:
> 
> George,
> 
>         Last week, the dive of 220 for 25 mins on 16/50 had an additional
> level of 90 added to it. You said that the additional level would wqipe out
> much of the deco, but showed stops above that and still switching to 50/50
> at 70'. Would switching to about a 40/60 for the 90' stop give the same
> results and wipe out the deco entirely since the window would also be wide
> open for the ppO2 at that point?
> 
>         Don


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