Sample of the photo-z angular correlation function between the photo-z bin i′ and j′, C_i^′j^′ (blue) and the cross angular correlation function between the spec-z bin i and photo-z bin j′, C_ij′ (red) to be used for true-z inference. The line and its associated color band are the median and 16 and 84 percentile among 100 mock runs. The whole redshift range [0.6,1.1] is divided into 10 photo-z bins, each of width Δz_p = 0.05. This results in a true-z distribution with resolution of Δz = 0.05. The label i-j represents i′j′ for photo-z correlation function and ij′ for spec-z-photo-z cross correlation function respectively. We only show the odd bin results for clarity.