Top panel: Flux correlations of narrow emission lines of both [O III]λ5007 Å (in blue) and narrow Hα (in red) in the 669 AGN pairs with a redshift difference smaller than 0.001 and with a position distance smaller than 30 arcmin. Bottom panel: Dependences of narrow emission line flux ratios on position distance. In the bottom panel, the symbols in blue and red show the flux ratios respectively of [O III]λ5007 Å and of narrow Hα in the 669 AGN pairs.