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Two errors have been detected. First, the actual auxiliary variable used in several figures of the paper is instead of the one of equation (1). Then, the sentence below equation (1) should say that scales with the square root of the logarithm of B. Also, in lines 11¿ of page 9, it should say 'around 2 where B/BM 0.02', instead of B/BM 0.01. Second, a logarithm is missing in equation (20), the correct form being This agrees perfectly well with the scaling shown in figure 4(c).
plasma; modeling; magnetic nozzle; electron cooling; kinetic