 Cross sections on carbon and on the water can be determined from a comparison of neutrino interactions in the two FGDs.The Electromagnetic Calorimeter (ECAL) surrounds the inner detectors (P0D, TPCs, FGDs) and consists of scintillator layers sandwiched with lead absorber sheets.Its role is to detect neutral particles, especially photons, and measure their energy and direction, as well as to detect charged particles providing additional information relevant for their identification.