Help Needed: Gambit Problem (2-D)

Huawei

Hi, My Friends:

I have a problem to plot my calculation domain(2-D). One part of its form is the function of y=tanh(x). Could I find this function in Gambit, and directly use it to plot the form of domain?

(By the way, at present, I used a not good method to plot that part domain(y=tanh(x)). I input many points of this function into Gambit, then connected these points and smooth the curve to build the domain).

If you could take the time and trouble to give me some advice, I would much appreciate it.