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The radial profile of neutral gas density has been measured for a reduced‐density channel in 2.7‐kPa (20 Torr) air produced by an electrical discharge. Deflection by the channel of a He‐Ne laser is measured by a sensitive position detector, and the density profile is unfolded using an Abel inversion. Density changes of ∼1017/cm3 in air can be measured by this means.