Agreement between w(θ) of a subset of mocks and the mean of w(θ) for all mocks as a function of the number of mocks used for the selection. The dotted red line stands for mocks of 300 deg², while the dot-dashed blue line represents mocks of 900 deg² and the dashed green one corresponds to mocks of 1500 deg² The solid black line stands for mocks of 4108.47 deg² with the mask of DES Y3 BAO data. The black open circle denotes the selection of the number of mocks and area used for the calibration in this analysis. The number 15 on the y-axis corresponds to the number of clustering measurements averaged (three angular apertures times five redshift bins).