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User input of [[gradient factor]]s is sometimes available for planning and real-time applications.
Gradient factors are a calculation trick (Erik C. Baker) that consists of taking a percentage of each M-Value (e.g. 90%) in order to increase conservatism (shorter duration without mandatory stops, longer and/or deeper stops) by reducing the maximum amount of neutral (inert) gas (e.g. nitrogen) accepted when approaching the surface (Maximum Value of each tissue compartment at... 9 m, 6 m, 3 m, surface).<ref name="Foret-1" />.
It is generally possible to define two GFs: GFlow and GFhigh. GFlow applies to the first (deepest) stop, GFhigh to the last stop (closest to the surface). Any intermediate GFs (between GFlow and GFhigh) are calculated by linear interpolation.
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