Access via selection in the menu from File Export VTK...

This menu item allows the data to be saved in VTK format.

Once confirmed, the data will be saved.

VTK = Visualization Toolkit

"The Visualization Toolkit (VTK) is a free software system for 3D computer graphics, image processing and scientific visualization" (from: Wikipedia).

The VTK was implemented in SPRING to provide a corresponding data interface to other graphics programs.

Output of streamlines