Spectral fidelity of an arc-line in the H-band as a function of spatial position across all 24 IFUs, when interpolating with a linearly distance weighted average of nearest neighbours. The offset of the line from its nominal position (blue), and its FWHM (red), are shown. Top: for a cube reconstructed from a single exposure. Bottom: using the multi-reconstruct scheme described in Sect. 4.2 to generate a single cube from 6 input frames at different rotator angles. The improvement can be quantified in terms of the rms error in the line position, which is 2.8 km s-1 for the single frame, and 1.2 km s-1 when using 6 frames simultaneously.
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