Thanks for such quick answer.
I flipped alpha and beta because it does matter.
As far as I understand, rho notation is following:
first symbol means “source” atom type, next one is “target” atom type, isn’t it?
Like rho_H_Fe means induced electron density by H-atom to Fe-atom.
And so, for embedding function I must use F with the second symbol (“target” atom type).
In my example it is F_Fe.
This is my confusion.