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A. Mebrahtu, Mekelle, Ethiopia (alemmeb@googlemail.com) M. Petitdidier, Laboratoire d'Atmosphere, Milieux, Observations Spatiales, IPSL-10-12 Avenue de l'Europe

B. Rabiu, Centre for Space Research and Applications, Federal University of Technology, Akure, Nigeria (tunderabiu@yahoo.com) C. Reeves, Earthworks bv