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In the half dose, four 100 μs pulses, and in the single dose, eight 100 μs pulses were applied. In the split dose, two trains of four 100 μs pulses were applied and the delay between the end of the first and the beginning of the second train was 1, 2 or 3 min. In all experiments, 300 V or 0.75 kV/cm were applied. The repetition frequency was 10 Hz.
