The same energy has to be spread, how how does it gets spread? It is spread such that in some fashion the total energy still remains constant. So, here you know now that the spreading function tells us that, look maximum will be always on this because, the wind is blowing this side when you expect that; as it goes there will be less and less energy form more and more direction ultimately 90 degree should be 0, this is what we are doing, so you are pulling it down here and spreading like you are, it is something like you know I can give example in a graphic form like, if there is a graph then you push it down and kind of like like a cake where you pushed and made a made a pyramid. See, like there was a small piece of you know like two-dimensional body was there, this this area was this thing you just pressed it and made it made a bell, made a made a pyramid.