1D cuts through the X-point shown in Figure A1 at ﹩t=784{{\rm{\Omega }}}_{c,i}^{-1}﹩. Panels (a) and (c) are taken along the local normal direction ﹩\hat{{\boldsymbol{n}}}﹩ and show, respectively, the reconnecting magnetic field component B_t and the electron out-of-plane current density J_z,e. Panels (b) and (d) are taken along the local exhaust direction ﹩\hat{{\boldsymbol{t}}}﹩ and show the projected electron and ion outflow velocity, δu_e,out and δu_i,out, respectively, defined relative to the center-of-mass velocity at the X-point. The coordinate origin marks the X-point position.