# 3.3.11. Model File¶

For a given model, the model file has the following format:

$$m_1$$
$$m_2$$
$$m_3$$
$$m_4$$
$$m_5$$
$$m_6$$
$$\;\vdots$$
$$m_{N-1}$$
$$m_N$$

where $$N$$ is the total number of cells in the corresponding tensor or Octree mesh.

## 3.3.11.1. Conductivity Models¶

For conductivity models, conductivity values are entered in units S/m.

## 3.3.11.2. Active Cells Model¶

Within active cells models, all cells lying below surface topography (or set as active) are given a flag value of 1. All inactive cells are given a flag value of 0.