Table 1.

Magnetic field strength of Magnets 1–4.

Location	Magnet 1	Magnet 2	Magnet 3	Magnet 4
at b or c in Figure 1 (mT)	34.5	48.3	80.1	107
at a in Figure 1 (mT)	22.0	28.1	43.4	55.3