3.3.7. Model File

This file contains the cell values of the conductivity or chargeability model. The conductivity must have values in S/m, while chargeability is often unitless. Inversion models (forward, initial, reference, and recovered) are in this format. The following is the file structure of the model file:

\(\sigma_{i}\)

Conductivity of the \(i^th\) cell. The conductivity is always in S/m. There are no a priori bound constraints set on the recovered conductivity model unless specific bound constraints are applied by the user.

\(\eta_{i}\)

Chargeability of the \(i^th\) cell. The chargeability is typically unitless. Since chargeability ranges between [0,1), a positivity constraint should be applied.

\(M\)

The total number of cells in the model and its associated mesh (either octree or tensor).