So, that is why we need to sort of pay little attention. Now, see here we have got, what
do have if you take a ship in a irregular wave, the irregular wave eta or T looks like very
irregular. Now, you have put your ship there and you want to measure your let us say,
heave or some response. Let us say heave, we have measure Z T, Z T also look
something, like irregular isn’t it? See, if you have an irregular wave, then let us say you
went down to irregular wave and put as beta to measure how much it is heave, so it will
look irregular record.