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Three-dimensional density profiles of argon metastable atoms (Ar m* ) have been measured by laser-induced fluorescence in a direct current glow discharge with flat cathode, for a range of voltages, pressures and currents (i.e. 700-1200 V, 0.7-1.6 torr, 0.6-3.3 mA). The primary excitation line was taken to be the 794.818 nm line, whereas the 852.144 nm line was used as the fluorescence...