Monopole of the contaminated sample auto-correlation (dashed black line) compared to the intrinsic correct galaxy (blue line) and line interloper (green and pink line) auto-correlations, not weighted by the prefactors in Eq. (17). The 2PCF are averaged over the EuclidLargeMocks in z ∈ [1.3, 1.5]. We can appreciate both the dilution of the clustering amplitude in the presence of contamination and the distortion of the line interlopers’ signal, in particular the shift of the BAO peak.