optional, single

—

The element indicates the value for the "Gradient Factor Low" (GF Low), given as a real number 0.0 <= GF Low <= GF High <= 1.0. For further explanation see Clearing Up The Confusion About "Deep Stops" by Erik C. Baker, e.g.

<gradientfactorlow> should be less than <gradientfactorhigh>.

<buehlmann>

—

<decomodel>, <gradientfactor>, <gradientfactorhigh>, <tissue>

(see also <decomodel>, and <buehlmann>)

<!-- GF Low = 0.35 -->
<gradientfactorlow>0.35</gradientfactorlow>