Left panel: J123646+621405 when divided by the CLEAN model of the source. The low signal to noise results in an imperfect CLEAN model. This creates deviations from a normalised point source and, as a result, the peak brightness is ~1.4 Jy/beam. Because the model cannot fully characterise the source structure, some of the flux density will be scattered into the side lobes. This results in a slightly reduced S/N of 7.7 compared to 7.9 before dividing the CLEAN model. Right panel: deconvolved image of 9 different, combined target sources, including the source in the left panel. Each source has been divided by its CLEAN model and combined to create a point source with a higher signal to noise. The deviations from a perfect, normalised point source have reduced and the peak brightness is ~1.1 Jy/beam. This is the source used to self-calibrate the HDF-N data set in MSSC. The source morphology is more representative of a point source and the S/N has vastly increased to 93.1 which allows self-calibration to be performed.