Total observed QSO–LBGs pairs in the whole survey for our selections with Poisson error bars compared with the expected number of QSO–LBGs pairs, assuming the cross-correlation parameters for Case 5 and using the redshift selection function ﹩{\phi }_{Z}(Z)﹩ computed for each case as we described in Section 3. The solid line indicates the case where ﹩\langle \mathrm{QG}{\rangle }^{\mathrm{obs}}=\langle \mathrm{QG}{\rangle }^{\exp }﹩. Our results show that the three more conservative cases (non-contaminated samples) are consistent with the expectation, which means that the modeled redshift selection function ﹩{\phi }_{Z}(Z)﹩ is sensitive and that the levels of contamination in those selections are negligible.