Parameter Identification

[TylerGriffin99]

Hello, Great model.
I want to adapt it to a different crop type and have information on the ETo and ETc and root depth and want to know how to do this using your function.

In the data file there are 4 parameters per line the first is rainfall but what are the other 3? I didnt see any mention of this in the book or the code

thanks in advance