in low S/N regime some stations are set to 0 and some other to high values

Created by: revoltek

when I solve diag+rot or diag in regions with noisy data some stations are set at 0, some others at very high values (the effect varies with different weights). Note that in many cases the first ~half of the stations are set to high values and the second half to 0.

See: https://www.dropbox.com/s/5qlfqi5bg9ol5pz/amp_polXX.png?dl=0