The first author acknowledges support from the National Natural Science Foundation of China (No.41074083).
and would like to thank Xiaolei Song, Jingwei Hu, Siwei Li, Tengfei Wang and
Chenlong Wang for useful discussions.
Constructive comments by Tariq Alkhalifah, Alexey Stovas, and two anonymous reviewers
are much appreciated. We thank SEG, Hess Corporation, and BP for making the
2D VTI and TTI models available.
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