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Since the first sonic logging tool used for the petroleum industry in 1950s, we have seen many generations of acoustic<br>measurements. The hardware and software changes made over the decades focused mainly on the improvements of<br>compressional and shear measurements which are one dimensional in the near-wellbore region. To understand the complicated<br>reservoirs today, there is a need to look at the compressional and shear slowness in three dimensions.