Constraints on (α_∥, α_⊥) for cross-correlation (red) and combination with auto-correlation (black). Contours correspond to confidence levels of (68.27%,95.45%). The black point at (α_∥, α_⊥)=(1, 1) indicates the prediction of the Planck (2016) best-fit flat ΛCDM cosmology. The effective redshift of the combined fit is z_eff = 2.34 where the fiducial distance ratios are (D_M/r_d, D_H/r_d)=(39.26, 8.58).