Beside the periodicity as discussed above, the other idea is sparsity.
By implementation of more Abelian group attributes,
events will be increasingly sparse, and primaries and multiples
will be more easily differentiated. This helps us to avoid identifying
multiples and peglegs as primaries. The next Abelian group attribute candidate
to be implemented is anelliptic factor. This would better model non-hyperbolic
effects that might be either extrinsic and due to layering, or intrinsic,
if the layered material was anisotropic.
As *m*=*g*3/(*T*.*V*_{nmo}^{4}), there is still
the problem of different
sensitivity between small and large *T*.
It seems to me that this different sensitivity
does not offset the first one.
Since the use of the two weighting functions in the paper
is not satisfactory enough,
we need a better strategy to handle the different
velocity sensitivity between
shallow and deep parts in the velocity transform.

11/18/1997