The Extrapolation Engine may be controlled using the radio buttons located on the Engine Toolbar, which perform the following actions:

•  : Runs the extrapolation process in a parallel execution thread without blocking the current execution thread. When running the extrapolation in this mode, all IDL console messages are logged in the Extrapolation Bridge.log file, which is automatically created in the current IDL working directory.
•  : Pauses the current extrapolation process
•  : Aborts the current extrapolation process
•  : Runs the extrapolation process in the IDL execution thread, which is blocked until the extrapolation procedure returns. This options allows the user to debug the IDL code using the standard IDL debugging tools.

Any grid layer of the output datacube may be displayed as an image using the vertical scrollbar for selecting the vertical index of the datacube layer.

Using the Multi-Level Extrapolation Option

Optionally, the extrapolation may be divided in an adjustable number of vertical Levels, each of them containing Nz grid layers. When using this option, the data cube layer computed in a precedent execution level may be displayed while the next level is computed in a parallel thread.

However, this option should be used with caution since, when using an extrapolation engine based on a 2D LOS magnetic map, each new level uses as input map only the Bz component of the top output map of the preceding level, which inherently introduces artifacts in magnetic datacube.