Each row of images showcases the iterative self-calibration process of one calibrator in correcting direction-dependent effects. The three columns show mages of the four candidates with zero, two, and four iterations of self-calibration, representing no correction, dTEC-only correction, and corrections for dTEC, amplitude, and phase, respectively. Each image has a size of 64 × 64 arcsec and contains 1600 pixels by 1600 pixels.