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Dependence of the discharge voltage U (full curves) and the cathode potential fall Uc (dotted curves) on argon pressure p at the current I = 0.5 A and anode surface area Sa = 0.064 (1), 0.032 (2), 0.016 (3), 0.008 (4), 0.004 (5) and 0.002 m2 (6). At p < po the voltage rises and at p = pex the discharge extinguishes.
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