Why does steady-state magnetic reconnection have a maximum local rate of order 0.1?

Liu, Y.H., Hesse, M., Guo, F., Daughton, W., Li, H., Cassak, P.A. and Shay, M.A. (2017), Why does steady-state magnetic reconnection have a maximum local rate of order 0.1?, Phys. Rev. Lett. 118 (8), 085101, doi.org/10.1103/PhysRevLett.118.085101