The PYREX experiment was made possible by the participation of a large numberof institutes and funding agencies. The participating institutes are CNRM, CRPE, LA, LAMP, LMD, LSEET, SA, EDF for France; INM, UV, UIB for Spain; and DLR for Germany. Funding was provided by Météo-France, INM, INSU (ARAT, PATOM and PAMOY programs), CNES, EDF, DLR, and Région Midi-Pyrénées. Much technical help was provided by CEV, ENM, and the French and Spanish Air Force and air control authorities. We would like to express our gratitude to J. C. André, D. Cadet, D. Guedalia, and A. Ascaso Liria for their help in the planning of this program. We also would like to express our deep appreciation to the many colleagues who have participated to the success of the experiment through enormous personal commitment.
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