If basic pressure change that stays, apart from that there are four wave systems the one that is due to forward end will have a predominant wave crest generated due to the forward discontinuity and it may look something like this. Then, as we have seen, there will be a wave system due to aft end, which may look something like this am I clear? And due to the aft shoulder we will have a third forward shoulder, we will have a third wave system as we have seen this will generate a trough, so you will have a wave system, which may look something like this. And finally, due to the aft shoulder you will have another wave system. So, you will have four wave systems, the most prominent ones are the forward wave and the stern wave with crests being generated at the forward end and stern end, and the shoulder waves generating troughs at the forward shoulder and aft shoulder will also be there.