pmosmem: This is another maximum entropy deconvolution task.
It differs in that it can perform a joint deconvolution of the four
Stokes parameters simultaneously. With polarised emission being potentially
positive and negative valued, the entropy measure for this is different
from a simple total intensity deconvolution. See
Sault et al. (1999)
(A&A, 139, 387) for more background on joint polarimetric deconvolution.
Often joint polarimetric deconvolution does not do a better job than
doing the different polarisations individually (e.g. by using
clean, or by using maxen
and the maximum emptiness entropy