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with METHOD = SDI
Perform a Steer-Dewdney-Ito CLEAN. This clean method selects an ensemble of clean components and remove them at once using FFTs. It works best for extended sources and UV coverages with short spacings. In such a case, it may avoid the "ringing" features which appear using the CLARK or HOGBOM techniques. In mosaic mode (see command MOSAIC), a mosaic clean is performed.
SDI is very sensitive to the selected support (see MASK and SUPPORT commands), especially when the dirty beam sidelobes are significant.