The [SQUID]2 Z signal over a 30 min. period showing the burst noise which was corrected by software. The lines have been offset for clarity.
Magnetometry signals recorded in the LSBB Capsule (Top: NS, middle: EW, bottom: Z) over a 72 h period during a public holiday in 2011, when there was no activity in the laboratory. The left hand plot shows the field measured by the Oxford system (in black); and the signal from [SQUID]2 system after the linear transform (in red). The two lines overlap almost perfectly. The right hand plot shows the difference between the two lines.
RMS difference between the transformed [SQUID]2 data and the Oxford signal for the three channels. These values are the mean of the RMS difference for periods of the given duration within the 72 h measurement shown in Fig. 2 .
Top: the scaling parameters which give the best fit of the three signals recorded by the [SQUID]2 magnetometer, to a single signal recorded by the Oxford system, as described in Sec. II C . Bottom: the angles between the axes of each magnetometer, determined from the arccosine of the scaling parameters.
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