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Asymmetrical GFs (e.g. 30/70) can be used to force deep stops (e.g. heliox or trimix dives when the algorithm used is not sufficiently conservative). Deep stops can be defined as follows: “one or more voluntary or empirically derived decompression stops that are deeper than any prescribed by the algorithm utilized”<ref name="Deep-Stops" />.
GFs can be implemented in dive computers in three ways:
- with a preset mode (e.g. L0, L1, L2 ... or P0, P1, P2 ...) corresponding to a decreasing twin pair: 90/90; 85/85;80/80... ;
- leaving GFlow and GFhigh free for input;
- by integrating into the algorithm a modification of GFs according to diver behavior (profile, ascent speed, etc.).
In all cases, the choice of GF values is arbitrary.
==Tables==
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