### CLEAN ideas

The family of CLEAN algorithms is based on the a priori assumption that the sky intensity distribution is a collection of point sources. The algorithms have three main steps

Initialization
  - of the residual map to the dirty map;
  - and of the clean component list to a NULL (i.e. zero) value.
Iterative search
  for point sources on the residual map. As those point sources are found,
  - they are subtracted from the residual map;
  - and then they are logged in the clean component list.
Restoration
  of the clean map 1) by convolution of the clean component list with the clean beam, i.e. a Gaussian whose size matches the synthesized beam size and 2) by addition of the residual map.

Subsections

- Stopping criteria
- Stability criterion
- Formation of the CLEAN map