Left-hand panel: Blue dots are the observed mean CCF ωobs of the less-luminous quasars and the LBGs at z ∼ 4 obtained from the Jackknife resampling. The black solid line is the best-fitting power-law model using ML fitting on the scale of 10|${^{\prime\prime}_{.}}$|0 to1000|${^{\prime\prime}_{.}}$|0. The red dash–dotted line is the best-fitting dark matter model ωDM (red long-dashed line) adopting ML fitting in the same scale based on the HALOFIT power spectrum (Smith et al. 2003), while the blue dash–dotted line is the best-fitting dark matter model |$\omega _{\rm DM}^{\prime }$| (blue short-dashed line) after considering the contaminations of the less-luminous quasars and the LBGs. Right-hand panel: Blue stars are the observed mean CCF ωobs of the luminous quasars and the LBGs at z ∼ 4 got from the Jackknife resampling. Red and blue lines have the same meaning as in the the left-hand panel but the blue line only considers the contamination of the LBGs. The orange dash–double-dotted line is the expected CCF of the luminous quasars estimated by the luminous quasars ACF in Shen et al. (2009). The green thick long-dashed and pink thick dashed lines are the best-fitting power-law models on the scale of 40|${^{\prime\prime}_{.}}$|0 to 160|${^{\prime\prime}_{.}}$|0 and of 40|${^{\prime\prime}_{.}}$|0 to 1000|${^{\prime\prime}_{.}}$|0, respectively. In both of the panels, symbols just on the horizontal axis with no error bar beyond 10|${^{\prime\prime}_{.}}$|0, those with no error bar within 10|${^{\prime\prime}_{.}}$|0, and those with error bars in the top pad mean negative bins with a small error bar, zero bins without pair count, and negative or zero bins with a large error bar, respectively. Top and bottom panels show the logarithmic and the linear scale of the vertical axis, respectively. The top horizontal axis of the top panel implies the comoving distance at redshift 4. (Color online)
