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[0219] The mean values found were -40.7 kV/m (rounded up to -41 kV/m) for F mean’ -58.3 kV/m for F min and -22.6 kV/m for F max• The difference between the mean maximum and mean minimum electric field strength F max and F min’ which is referred to as field strength variation in the context of the invention, is thus -22.6-(-58.3)=35.7 kV/m (rounded up to 36 kV/m). 

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