Sketch of the W50 model as a combination of isotropic and polar winds. The central region represents a combination of an isotropic wind and a more collimated polar wind aligned with the orbital axis of the binary system. The isotropic wind passes through its termination shock, and the increased pressure and density recollimate the polar wind. The resulting recollimation shocks accelerate particles and give rise to the synchrotron emission of the EXJs.