1. Paradigm Geophysical Corporation, Gav-Yam Center No. 3, 9 Shenkar Street, P.O. Box 2061, Herzlia B 46120, Israel..
2. Tel-Aviv University, Department of Geophysics, Tel-Aviv 69978, Israel and Paradigm Geophysical Corporation, Gav-Yam Center No. 3, 9 Shenkar Street, P.O. Box 2061, Herzlia B 46120, Israel..