How to get the mass flow of some species out of the domain in Non-premixed model(PDF model)?

[Sacaq]

Hi~
I am using Non-premixed model in ANSYS14.
T try to find the mass flow rate of a certain species out of the surface in a domain.

Originally, the mass flow can be written as "F_FLUX*F_YI"
However, I found it is not allowed to use F_YI when Non-premixed model was applied, that is written in the manual
"3.2.3.6.1. Species Fractions Calculations with the Non- and Partially- Premixed Models."

Therefore, how do I get the mass flow of some species out of the domain?

Pdf_Yi is in this pattern " Pdf_Yi(c, t, n)".
That is "Pdf_Yi(cell_t c, Thread *t, int n)".

Is it correct to describe the mass flow rate of a certain species out of a domain like "F_FLUX(f,f_thread)*Pdf_Yi(c,c_thread,5)" ?
In the other way, I don't know if it is right to write like "F_FLUX(f,f_thread)*Pdf_Yi(f,f_thread,5)"?
Both of the codes could be compiled and could be executed, however, I don't know which one is correct or how to modify the code.

The same thing may appear in F_YI(c,t,i) or C_YI(f,t,i)?

Could anyone kindly help?
Thank you!