  Separation of variables (SoV) is an extremely efficient and elegant technique
for analysing physical systems but its application to integrable spin chains
was limited until recently to the simplest su(2) cases. In this paper we
continue developing the SoV program for higher-rank spin chains and demonstrate
how to derive the measure for the su(3) case. Our results are a natural
consequence of factorisability of the wave function and functional
orthogonality relations following from the interplay between Baxter equations
for Q-functions and their dual.
