Correlation between parameters of the ΛCDM model for a DESI like survey. Top panel: angular galaxy clustering alone, central panel: ARF alone, bottom panel: combination of both observables. We see that the angular galaxy clustering and ARF have opposite correlation coefficients between cosmological parameters and the galaxy bias. The combination of both helps significantly to break degeneracies with the galaxy bias. (a) D_g, (b) D_z, (c) D_g, z.