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(a) The predicted opening angle made by the upstream magnetic field on side 1 is plotted as a function of Bx1 /Bx2 and n1 /n2. (b) The predicted opening angle made by the upstream magnetic field on side 2. (c) The contour of the predicted reconnection electric field normalized by the side 1 (magnetosheath) value. (d) The ratio of the predicted reconnection electric field to the prediction in equation (1) assuming 𝛿/L = 0.1.
