Calice Si-W EM Calorimeter: Preliminary Results of the Testbeams 2006

The CALICE Si-W electromagnetic calorimeter has been tested with electron beams (1 to 6 GeV) at DESY in May 2006, as well as electrons (6 to 45 GeV) and hadrons (6 to 80 GeV) at CERN in August and October 2006. Several millions of events have been taken at different incident angles and three beam impact positions. The ECAL calibration is performed with muon beams and shows a good uniformity for nearly all channels. The large statistics available allows not only to characterise the ECAL physics performance, but also to identify subtle hardware effects.