(a) 1D profile along the y direction of the top-to-total particle density ratio (solid line) and the bottom-to-total ratio (dashed line) in a slice at ﹩x\approx 1000c/{\omega }_{\mathrm{pe}}﹩, at time ﹩t\approx 8400\,{\omega }_{\mathrm{pe}}^{-1}\approx 0.60\,{t}_{{\rm{A}}}.﹩ The profiles are from the same simulation we show in Figure 3 (with ﹩{\beta }_{{\rm{i}}}=0.0078﹩ and ﹩{T}_{{\rm{e}}}/{T}_{{\rm{i}}}=0.1﹩). Vertical dotted lines indicate the locations in x where the top-to-total density ratio is between 0.3 and 0.7 (at ﹩y\approx -25﹩ and ﹩25\,c/{\omega }_{\mathrm{pe}},﹩ respectively). Between the vertical dotted lines (i.e., in the region we define as the reconnection downstream), mixing has efficiently occurred. (b) Proton and electron temperature profiles in the same region. In between the vertical dotted lines, the temperature profiles are nearly flat.