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Fig. 7

image

Time dependence of the mean and skewness of the log normalised electric field E/E(t = 0) between 10 and 50 s. Different colours relate to different levels of density fluctuations, similar to Fig. 6. The electron beam takes approximately 10 s before it start to produce significant levels of Langmuir waves.

This figure is made of several images, please see below:

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