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After migration, the first step to
estimating a new interval slowness model is to apply
residual NMO+DMO to the constant-offset sections. If the data
do not stack best for 
then moveout is still present
over offset which implies velocity errors.
I calculated the stack semblance for a range
of 
; 
by applying residual NMO+DMO
to the migrated constant-offset sections.
Figure 8 shows semblance versus residual slowness ,for the same four midpoints of Figure 6.