[1] Univ Montpellier 2, F-34095 Montpellier 5, France
[2] CNRS, IES, UMR 5214, UM2, F-34095 Montpellier 5, France
[3] IES, UMR 5214, F-30021 Nimes 01, France
[4] Ctr Natl dEtudes Spati, F-314019 Toulouse 9, France
[5] Vanderbilt Univ, Nashville, TN 37235 USA
[6] Test & Radiat TRAD, F-31674 Labege, France
[7] Platteter Enterprises, Bedford, IN 47421 USA