__Hi everybody. I have a question about RL-GO solver in FEKO. There is a capability to account for diffraction. The question is: does FEKO account for diffraction in the raytracing phase or only during the phase of summation of Huygens sources fields. In other words for the case of 3 interaction is there R-D-R and D-R-R rays, or only R-R-D, where R- reflection, D- diffraction.