English: . Decay time τ_m of the central density of a pure electron plasma as a function of helium gas pressure at magnetic fields of (□) 0.07, (⋄) 0.02, and (○) 0.004 tesla in a Penning–Malmberg trap experiment
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. Decay time τ_m of the central density of a pure electron plasma as a function of helium gas pressure at magnetic fields of (□) 0.07, (⋄) 0.02, and (○) 0.004 tesla