Using the L0 data to be generated in T6.3 as well as special matches generated using the FIDUCEO schemes, validate and provide FIDUCEO best practice radiances and uncertainties for the SLSTR IR channels. This will include an assessment of the SLSTR fundamental calibration algorithm as well as using the FIDUCEO uncertainty propagation methods, thus allowing detailed assessment of SLSTR non-linear radiance effects and spectral response functions which have been shown to be important for the AATSR FCDR. Write report.