So, if there is a relation between omega v and this roll, you see this is an example of a
container ship in waves. Now, there is an exciting force coming now, this particular
wave condition, it turns out that at some frequency give force that some force, it is
frequency dependent. Now, obviously, if you change the speed, the characteristic
changes and this is another thing that is important, because this is a typical phenomenon
that one use, in this example it was 20 knots, this 10 knots, this is actually 0 knot.