Figure~\ref{fig:elf-mig0}  is  result of the migrating the
data with the velocity of Figure~\ref{fig:vel0}.
At `A' we can see
some artifacts in the right portion of the migrated image
due to the coarse gridding  of the initial
velocity model.
The salt is generally poorly
defined. The top of reflection (`B') is discontinuous.
We  see very little of the salt edges (`C' and `D'), and have a 
non-continuous salt bottom
reflection (`E').
Reflections to the left of the salt body do not continue all the
way to the salt edge (`C').
In addition, there is  little resolution below the fault at 10 km (`E').
Figure~\ref{fig:moveout-vel0} shows every 10th CRP gather from the initial
migration.  The CRP gathers show significant moveout (`A', `B', and `C'),
complex behavior under the salt (`D'), and little  coherent energy
at some locations (`E' and `F').

\plot{elf-mig0}{width=6.0in,height=7.5 in}{Migration result using
the velocity from Figure~\ref{fig:vel0}. The salt is generally poorly
defined. The top of reflection (`B') is discontinuous.
we can see very little of the salt edges (`C' and `D'), and has a
non-continuous salt bottom
reflection (`E').
Reflections to the left of the salt body do not continue all the
way to the salt edge (`C').
In addition, there is  little resolution below the fault at 10 km (`E').
}


\plot{moveout-vel0}{width=6.0in,height=8.0in}{Every 20th CRP gather from the
initial migration. The CRP gathers show significant moveout 
(`A', `B', and `C'), complex behavior under the salt (`D'), and 
little  coherent energy at some locations (`E' and `F').}

Using the initial migrated image I chose 11 reflectors to perform
tomography with (Figure~\ref{fig:overlays}). To constrain
the upper portion of the model I chose the
water bottom reflection and  two reflectors above the salt.
I picked the salt
top and salt bottom and three reflectors
on both sides of the salt body.
\plot{overlays}{width=6.0in,height=3.5in}{Initial migration
with picked reflectors overlaid.}

I  performed  moveout analysis using equation (\ref{eq:semb-anal}). 
I selected the semblance at each reflector, 
Figure~\ref{fig:elf-sem-ref.vel0}, and  found a
smooth curve using fitting goals (\ref{eq:smooth}).
The top two reflectors have have almost
no moveout errors and the third reflector very little.   
The remaining reflectors all have
some residual moveout errors that
tomography can attempt to resolve.

\plot{elf-sem-ref.vel0}{width=6.0in,height=3.5in}{Semblance panels from
nine of the reflectors used in the tomography. Note that that the
top two reflectors are generally flat. The third reflector shows minimal
moveout and the remaining reflectors
still have significant residual moveout.}
