Interpolation scheme illustrated in 2-dimensions. a) Observed data are sampled regularly in the reference frame of the detector (red points). b) This sampling is irregular in the reference frame of the reconstructed cube; bad pixels can simply be omitted from the set of valid samples. The calibration products directly provide the mapping from a) to b). c) One can freely specify the required gridding (i.e. spatial/spectral pixel scale) for the reconstructed data (green points); it is independent of the actual sampling on the detector, although the resolution one achieves is not. d) Each required grid point (green) is interpolated from sampled points (red) which lie in its local neighbourhood. Any suitable algorithm can be used for the interpolation.
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