Here is a field map of the magnet.

Calculation range covering the following 
coordinate space:
(Attention I changed the axes according
to standard z=beam)

axis                  calculated range

x: horizontal axis    +100 -> -100 cm

y: vertical axis      +110 -> -110 cm

z: beam axis           +30 -> + 70 cm   


point spacing 5 cm


file format of field.dat

    x   y   z    Bx   By   Bz