So, what happens you see it is goes something like that, that you assume that supposing all waves came from one side it would be like this, spectrum would become like that, but now this when all the waves are coming from this direction, but if all the waves are coming from this direction, all the wave come from this direction etcetera, it will be something else. Here, what we do you assume that as if some waves are coming from this direction, some of the energies because of waves coming from this direction, some from this direction, some from this direction.