  It was recently proposed that the electron-frame dissipation measure, the
energy transfer from the electromagnetic field to plasmas in the electron's
rest frame, identifies the dissipation region of collisionless magnetic
reconnection [Zenitani et al. Phys. Rev. Lett. 106, 195003 (2011)]. The measure
is further applied to the electron-scale structures of antiparallel
reconnection, by using two-dimensional particle-in-cell (PIC) simulations. The
size of the central dissipation region is controlled by the electron-ion mass
ratio, suggesting that electron physics is essential. A narrow electron jet
extends along the outflow direction until it reaches an electron shock. The jet
region appears to be anti-dissipative. At the shock, electron heating is
relevant to a magnetic cavity signature. The results are summarized to a
unified picture of the single dissipation region in a Hall magnetic geometry.
