The customary numerical solution to the x-domain forms of the equations in Tables .3 and .4 is arrived at by splitting. That is, you march forward a small -step alternately with the two extrapolators
Migrations that include the lens equation are called depth migrations. The term is often omitted, giving a time migration.
Observe that the diffraction parts of Tables .3 and .4 are the same.
Let us use them and equation (19) to
define a table of diffraction equations.
Substitute for i kx and
clear from the denominators to
get Table .5.