Visualization of Magnetic Field

I found a java applet for visualizing the magnetic field of a specified configuration of magnets on Paul Falstad's web site:
http://www.falstad.com/emwave2/directions.html

To use this applet, I first pressed "clear all."  Then I selected "Mouse = Add Magnet (Down)" and painted in the location of one magnet and similarly for another magnet (Up) and for a feromagnetic (iron) plate below.

The figure below shows orientation of the B lines.  Higher intensities are white and lower are green.

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