= exp(-A
_^2), (14)
_2)/p(_1) where
is the
observed wavelength and _2<_1---is
DP_ = exp(-A_^2), (14)
where A is the same for both sides of the source. The dispersion ratio is
D = 
(ln
DP_+/ln DP_-), (15)
and, for m=1, the angles are
_0 =
arcsin[(1-D^2)/(1+D^2)]. (16)
I have evaluated the angles for the sources in the GCL sample. Of the 48 sources in the sample, 10 either repolarize or are unpolarized. A further 5 have the asymmetry in the wrong sense and give negative angles.