...expensive

The cost of acquiring well log data is not high, but I include the high cost of drilling a well when I give well logs and crosswell techniques a "high" relative cost

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...medium

For most real materials, the observed anisotropy is somewhat anelliptic. However, the simplicity of the elliptical assumption makes it easy to conceptualize and to manipulate mathematically. Future views of this problem should address more complicated anisotropic assumptions, i.e., TI.

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