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. 2015 Aug 14;10(8):e0133120. doi: 10.1371/journal.pone.0133120

Fig 3. Relative concentration of the main emissive species in the guided ionization wave (conditions: He gas flow = 2slm; voltage frequency = 10kH; voltage amplitude = 5kV; voltage duty cycle = 1%.

Fig 3

Optical fiber placed 5mm after the exit ceramic tube).