Yet another CLEAN variant, similar to a Clark CLEAN, is the MX algorithm (Schwab 1984). During the major cycle, the Fourier transformed CLEAN components are subtracted from the ungridded residual visibility data, instead of the residual gridded visibility data (i.e. the FFT of the residual image). This means that the subtraction is more accurate. Miriad does not have a task which implements the MX algorithm.