You should enter the units of each argument that you will be passing to the subroutine. Units should be comma separated and correspond to the order used when setting the expression for a quantity in CFX-Pre. For example, enter [m], [m s^-1], [Pa] if you are passing a length, velocity, and pressure value to the subroutine. The values of arguments passed to a subroutine are specified when you set an expression for a quantity in CFX-Pre. For details, see Defining Quantities with User CEL Functions.