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In the left hand panel the response of the system is plotted over a 40 nT range. In this range the response of the system is clearly non-linear. However if one examines the curve within the dynamic range of the sensors ( ±1.5 nT) a linear approximation to the curve produces a less than 1% deviation at 1 nT (right hand panel). It should be noted that this deviation will differ between different sensor designs and assumes that the transverse fields are close to zero.
