This work was accomplished while the first author was on leave at the International Research Center for Telecommunication–Transmission and Radar (IRCTR) at Delft University of Technology and at KNMI, De Bilt, Netherlands. The hospitality of staff at IRCTR and KNMI was much appreciated. Gerard Kos of ECN made available the in situ aircraft data. We thank Stuart Young and David de Wolf for discussions on multiple scattering issues during the course of this study.
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