Figure 1: Discretized magnetization region 
m (blue) and measurement region 
h (brown).
m (blue) and measurement region 
h (brown).From: Solving Large-Scale Inverse Magnetostatic Problems using the Adjoint Method
Since the strayfield problem is scale-invariant, length units are omitted. The magnetization is defined on a unit cube. Measurement boxes of thickness 0.04 are located next to each side of the cube, using an airgap of 0.1 (the 2 boxes in front are not shown in the figure).
