.Modelica.Magnetic.FluxTubes.Shapes.Leakage.EighthOfHollowSphere .Modelica.Magnetic.FluxTubes.Shapes.Leakage.EighthOfHollowSpherePlease refer to the enclosing sub-package Leakage for a description of all elements of this package and to [Ro41] for derivation and/or coefficients of the equation for permeance G_m.