Constraints on Alcock–Paczyński parameter F_AP for cross-correlation (red) and combination with auto-correlation (black). Confidence levels of (68.27%,95.45%) are indicated with the horizontal dotted lines for the cross-correlation and dashed lines for the combined fit. The prediction of the Planck (2016) best-fit flat ΛCDM cosmology is indicated with the vertical dotted line at F_AP(z = 2.35)=4.60 for the cross-correlation and dashed line at F_AP(z = 2.34)=4.57 for the combined fit.