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Photographs of three distinctive plasma plume types generated using. (a) 2 μs pulse; mostly a dim (typical to a plasma bullet) area is seen; (b) 2 μs interruption; bright (I) and dim (II) areas are seen; and (c) 900 ns interruption; dark (I), bright (II), and dim (III) areas are seen. Images (a)-(c) produced using a 1 μs exposure from the beginning of the voltage rise phases labelled “0” in Figs. 1(b)–1(d), respectively.
