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· Just not enough dive time.
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I was intigued so I checked the web for an explantation. GF are quotes as 80/20 meaning percentages. Each one modifies a standard deco schedule and are applied to the deep and shallow stops respectively. From what I could gather a standard schedule is modified to add deep stops, but the theory goes that a long deep stop will alow off gassing of some tissue compartments but on gas other tissue compartments to near their max. So long stops are reduced using a gf this is the first figure (e.g. 80) the second figure (20) is used to modify the shallow stops. Between them they should give a better chance of avoiding dcs, but as you know the science is not proven.
If I have mis-understood that can someone let us both know, as I have to be honest it was a bit heavy.
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