Difference between two-point shear correlation functions from the two sub-samples (). The errors shown are defined as , where the subscript ‘D’ means the diagonal of a matrix, and the three unique parts of the whole covariance matrix are denoted as C_b for the blue sub-sample, C_r for the red sub-sample and C_br for their cross-covariance. We found these errors are close to the measurement errors reported by the TREECORR code (σ_measure/σ_C ≳ 0.8), indicating that the diagonal elements of the covariance matrix are dominated by measurement noise. The overall agreement between the two sets of data vectors with and without the shear calibration (orange crosses vs. black dots) indicates the multiplicative bias has little effect in this study.