"pic/freemod.png" width="469" height="329"></p>
<p>By typing boundaries for x, y and z the region can be limited and set to the desired
resistivity value. The forward modelling can be started to compare data and model response. 
</p>
<hr>
<h3><a name="import"></a>ASCII output of model</h3>
<p>To save the model it can be exported into an column-oriented textfile, named 
  like the datafile with extension *.mod, in the following format, one row for 
  each model cell.</p>
<pre>x_1 x_2 y_1 y_2 z_1 z_2 resistiv