Example of detector coordinate maps for bands 1A (left half of the detector) and 2A (right half of the detector) of the β (top), α (middle), and λ (bottom) coordinates. α and β are analogous to on-sky RA and Dec coordinates. α is ‘along-slice’ on the image slicer and varies within a slice, β is perpendicular to this and varies per slice. The wavelength varies from top to bottom. Note that for the wavelength map we do not show the right half of the detector, since 2A is centred 3 μm further than 1A.