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This Multi-scale CLEAN algorithm is similar to that of the GAUSS method, but uses discrete kernel. The implementation takes care of sharp edges, but is much slower than the GCLEAN command.
The implementation of Multi-scale CLEAN in IMAGER slightly differs from that of CASA . It is less optimized in terms of speed, but uses a better convergence scheme in which the scale chosen at each iteration is the one with best signal to noise ratio. Accordingly, it is very stable. Only 3 scales are used so far in IMAGER, with a size ratio controlled by CLEAN_SMOOTH.