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A physical model of spherical glow discharge stratification is suggested where the striations represent the electric double layers, where opposite charges, initially separated in space due to fluctuations or ambipolar diffusion, are then stabilized by the specific conditions of the gas media with negative differential conductivity. These conditions appear and disappear during the discharge development owing to plasma-chemical reactions. The model has been tested using time-dependent mass-spectrometry, as well as numerical calculations of the electron transport coefficients for the observed composition.