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The rough development of streamers has been studied by many and is reported well in literature. Here we will show the development of a point-plane streamer in artificial air (a mixture of 20% pure oxygen in pure nitrogen) in much better detail. This is done in a 16 cm point plane gap at pressures between 100 and 200 mbar. Positive high voltage pulses with amplitudes of 20 to 40 kV, rise times of 10...