Spectral fidelity of an arc-line in the H-band as a function of spatial position across all 24 IFUs, when using the cubic spline method for interpolation (with a single exposure). Note that this is, in fact, a series of 1-dimensional interpolations The offset of the line from its nominal position (blue), and its FWHM (red), are shown. For comparison to the other interpolation methods, the rms error in the line position, which is 1.5 km s-1.
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