Curves

Add - Used to move a curve from the Possible list to the Required list (that is, reintroduce any previously removed curves)

Remove - Used to move a curve from the Required list to the Possible list (that is, remove them from the graph)

Note:
The same button is used for Adding and Removing curves. When you click in the Possible list, then the button changes to the Add button, and when you clicks in the Required list, the button changes to the Remove button.

Up - Moves the selected curve up. (Has no visual effect)

Down - Moves the selected curve down. (Has no visual effect)

Reset

This resets the curve ordering and reinstates the original caption. Thus the graph will look the same as the Hydrostatics/Hydrodynamics default.