Time history of the reconnection electric field ﹩{E}_{y}﹩ (blue line), ﹩{\boldsymbol{J}}\cdot {\boldsymbol{E}}﹩ (purple line), and the ion temperature ﹩{T}_{i}﹩ (red line) for the runs in Group A. The initial ion temperature ﹩{T}_{i}=0.4167{m}_{i}{V}_{A}^{2}﹩ is presented by the black dotted lines. Three key time points are indicated by black dashed lines: the reconnection onset, the end of the electron-only stage, and the peak of the reconnection electric field, occurring at (a) ﹩t=84{{\rm{\Omega }}}_{i}^{-1},95{{\rm{\Omega }}}_{i}^{-1},126{{\rm{\Omega }}}_{i}^{-1}﹩ in Run A1, (b) ﹩{t}=62{{\rm{\Omega }}}_{i}^{-1},72{{\rm{\Omega }}}_{i}^{-1},108{{\rm{\Omega }}}_{i}^{-1}﹩ in Run A2, and (c) ﹩t=54{{\rm{\Omega }}}_{i}^{-1},66{{\rm{\Omega }}}_{i}^{-1},100{{\rm{\Omega }}}_{i}^{-1}﹩ in Run A3.