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     Scott, Trout, and List,

       In doing some RGBM schedules for you (Scott and Trout), the process of
    doing all 10.20/30 fsw stops on pure O2 in the habitat, followed
    by slow detoxing ascent at 1 fsw/min on Tmix or EANx makes things slightly
    muddled-- but easily resolved for calcs according to RGBM staging/phasing.
    This is NOT TRUE FOR HALDANE staging, so do NOT assume following in Haldane
    calcs in general, nor for time indicated (6 hrs combined habitat stop).


    FOR DECO STOP TIMES OF 6 HRS OR LESS, SUMMED AT 10 FSW, 20 FSW, 30 FSW
    (CUMULATIVELY), ONE STOP CAN BE DONE IN THE HABITAT AT 30 FSW ON PURE O2,
    FOLLOWED BY 1 FSW/MIN ASCENTS ON ANY DETOXING GAS.  This was verfied within
    the RGBM code simply by saturating a diver on 80/20 nitrox (air) or 80/20
    heliox just below 30 fsw, switching to pure O2 at 30 fsw and checking
    for deco -- none for any ascent rate and all limiting tmix gas fractions
    just entering habitat.  Saturation at 30 fsw is also worst case
    and RGBM staging would not let that happen below 30 fsw.

       Such makes RGBM deco scheduling for WKPP habitat/detoxing
    protocols simple and precise -- just run an RGBM deco schedule
    with a switch to pure O2 at 30 fsw, with ascent rate of 1 fsw/min after
    switch, add up times at 10 fsw, 20 fsw, 30 fsw, make real stop
    in habitat at 30 fsw for cumulative time, and detox as per needed on tmix,
    EANx, etc.

       Scott and Trout -- will send RGBM schedules as per this
    prescription (you may already have them).


     BW


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