Final NI-CU design. Left: Outer view of housing, bipod interface to NISP, and harness locations. Centre: Cross-section of the NI-CU main body with illumination-critical components. The LEDs are pointing downward, illuminating the reflector patch with tilted surface (enlarged on the right). A number of baffles inside NI-CU shapes the beam to just illuminate the detector array, while minimising straylight.