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(Color online) Schematic drawing of the experimental setup.
(Color online) Discharge images under different : (a) , (b) , and (c) .
(Color online) Plasma length as a function of and tip radius.
(Color online) Waveforms of the applied voltage and light emission under different values of . (b) is an enlarged part of (a). (a)–(e) correspond to the corona discharge mode shown in Fig. 2(a). (f) corresponds to that of a plasma plume.
Optical emission spectra in the range from (a) and (b) .
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