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The high-voltage (HV) nanosecond discharge in wide pressure range develops in the form of the streamer discharge. Intensified charge-coupling device images of the discharge development and propagation in pure air are presented. For cathode-directed streamer, the area of streamer branching is obtained as well as dependence between branching intensity and discharge parameters. The streamer structure has been measured when the streamer was initiated by a long HV pulse.