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[0217] In Tab. 3 and 4, the individual electrostatic field measurements for Example 2 and Example 21 are shown in detail by way of example: 

[0218] For each disc, a mean electric field strength (F mean) was determined from the 200 individual values acquired per revolution. Furthermore, the respective m1mm um field strength value (F min) determined per disc and the respective maximum field strength value (F max) were determined. The mean values for all 100 discs were then calculated from F mean’ F min and F max• 

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