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We present an updated extraction of the proton electromagnetic form factorratio, mu_p G_E/G_M, at low Q^2. The form factors are sensitive to the spatialdistribution of the proton, and precise measurements can be used to constrainmodels of the proton. An improved selection of the elastic events and reducedbackground contributions yielded a small systematic reduction in the ratio mu_pG_E/G_M compared to the original analysis.

Low Q^2 measurements of the proton form factor ratio $mu_p G_E / G_M$