approximately. Remember, we need to have this feel of this number, which we will see from spectrum eventually. So, what happens, you will find out that if 20 knots wind is blowing, practically, no wave waves if I break down the signal; longer than 500 meters or shorter than 50 meters. Most of the waves are within that; of which maximum waves might have occurred at this length, which might be equal to say 200 meters. Now, take another location; same wind; maybe its shape is different. Same location, more wind; maybe, it may be different. But, point remains is that in a given location, given bathymetry, given wind speed, the kind of energy transfer that would excite waves, you expect them to be having a similar bandwidth, similar nature. So, oceanographic people would have actually gone round and they would have found out this. And, they found out that the shape of that for a given location remains more or less similar; and, that is very rational, very logical. Let us look at some property of this wave