Generate the velocity PDD

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Generate the velocity PDD The shape of the
velocity PDD depends on our knowledge about the
velocity structure for the region of interest. If
the velocity structure is well known and
relatively homogeneous, then the velocity PDD can
have Gaussian shape. If the region is highly
heterogeneous and/or with unknown velocity
structure, then the PDD function will have
irregular shape. It can be generated from
published data in the literature. In our case we
used the velocity model of Kaufmann.