2-point correlation functions determined from the N_side = 64 Planck CMB 2018 temperature and polarization maps. Results are shown for the Commander, NILC, SEVEM, and SMICA maps (first, second, third, and fourth rows, respectively). The solid lines correspond to the data, while the black three dots-dashed lines indicate the mean determined from the corresponding FFP10 simulations, and the shaded dark and light grey areas indicate the corresponding 68% and 95% confidence regions, respectively.