from CREST to TROUGH,
which means:
A . From side yo side
B . From left to right
C . From bow to stern
D . From top to bottom
![from CREST to TROUGH which means A From side yo side B From left to right C From bow to stern D From top to bottom class=](https://us-static.z-dn.net/files/d5e/6b9553da3a03ded42438a2385eaf8101.png)