;z(m), Btrans(G), Angle(deg), Bx(G), By(G)
  -15.0000      0.177   -152.220     -0.156     -0.082
  -12.5000      0.217   -170.160     -0.213     -0.037
  -10.0000      0.287    177.072     -0.287      0.015
   -7.5000      0.378    166.044     -0.367      0.091