Manfred Wendisch is gratefully acknowledged for providing a copy of the numerical data for the Po Valley FSSP and PVM measurements shown in Fig. 1, for detailing the operation of his FSSP during that campaign, and for helpful discussions related to this paper. Gerard Kos is thanked for providing information for Table 1 and John Knollenberg for providing the dimensions of the flow-accelerator insert for the FSSP. One of us (GF) was supported by GSI, and one of us (HG) was supported in part by NSF (ATM-9521073.)
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