Self-calibration of the four calibrator candidates, where attempts to correct for direction-dependent effects (DDEs) ware unsuccessful. The three columns show mages of the four candidates with zero, four, and eight 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.