We report measurements of the ratio of positively charged to negatively charged pions electroproduced at 0° and 90° in the virtual photon-nucleon center-of-mass system. The pi+ / pi- ratio is studied as a function of W, Q^2, omega , x_T, and x in the range 2.1 GeV <~ W <~ 3.2 GeV and 1.2 GeV2 <~ Q2 <~ 9.5 GeV^2.
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