Where the magnetic fields are concerned, it has to be noted that the "stealthy" properties of C-CSH also lead to much smaller errors of m caused by the trapped field of the superconducting magnet . They are also reduced 20 to 30 times, from a level of about +4 × 10 -7 emu when the specimen is housed in a single capsule to the magnetometer noise level of 10 -8 emu in C-CSH. Note that the shift of m due to the presence of uncompensated capsules on the return from a trip to high positive fields causes a shift of m towards positive values and it will be negative on the trip back from high negative fields, adding a FM-like hysteresis feature to the results of considerably high height of about 8 × 10 -7 emu, an important value to address in the precise magnetometry of weak signals.