of spacecraft offsets, the vector axes of each MAG are orthogonalized using an alignment matrix determined during pre-flight testing. The alignment matrix, is determined through the process documented in and and verified by methods outlined in .

In addition to the removal of spacecraft offsets and sensor orthogonalization, the merged data set corrects gain and phase shifts associated with the analog Butterworth filter using a convolution of the MAG output with the linear time-invariant inverse filter response. When appropriate, the digital Bartlett filters used to downsample MAG measurements are additionally inverted. Though the phase shifts associated with these low pass filters are quite small (e.g. Figure \[merging\_resp\]) over the range of frequencies observed by both the MAG and SCM, the mis-alignment of the relative phase between the MAG and SCM leads to undesirable artifacts in the merged data product. Correction for complex instrumental response (i.e. filter gain and phase) is not implemented in the un-merged calibrated data.

Search-Coil Magnetometer (SCM)
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![(a) MAGo frequency response is dominated by single pole Butterworth filter response tuned to -3 dB at the survey mode Nyquist frequency ($f_{svy}^{max}/2$). (b) SCM frequency response determined from a spectral analyzer. A 4-pole, 2-zero fit analytical fit is 