two fpfit plots on one with estopts

Hello stata-users,
I have tried plotting two fpfit curves on one graph using

Code:

twoway (fpfit var1 var2) (fpfit var1 var2)

which worked perfectly fine. For fractional polynomial fitting, it automatically assigns a degree but I wanted to increase the polynomial degree so I used the code

Code:

twoway fpfit var1 var2, estopts(degree(3))

with varying degrees. But now that I am trying to put the two graphs together, it tells me that "option estopts() not allowed".
Does anyone know why that might be happening?

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