Rolf Philipona directed the experiments, made the analyses, and wrote the manuscript. Andreas Kräuchi provided new technology for flying, tracing, and recovering the payload of the special balloon flights. Gonzague Romanens, Gilbert Levrat, and Emmanuel Brocard helped to launch, track, and recover the special sondes. Paul Ruppert provided the knowledge on thermocouple measurements and helped with the analyses. Pierre Jeannet checked the results and applied the new radiation correction on previous measurements. Dominique Ruffieux and Bertrand Calpini participated in many discussions and various tasks. All authors reviewed the manuscript. The authors would like to acknowledge the radiosonde group of the Payerne aerological station for helping to launch the special radiosondes for these particular experiments.
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