...report

http://sepwww.stanford.edu/public/docs/sep95

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...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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...SV-waves

I omit the qualifiers in ``quasi-P-wave" and ``quasi-SV-wave" for brevity

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...Lumley

Chevron Petroleum Technology Co., Consulting Professor at Stanford University.
email: lumley@chevron.com

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...name

Any fact this basic should be named in some earlier field of mathematics or theoretical physics. Admittedly, the concept exists on an infinite Cartesian plane without a helix, but all my codes in a finite space involve the helix, and the helix concept led me to it.

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...all

up to 99

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...tag

Note that file name is the first parameter in from_aux but the last parameter in to_history. This avoids the necessity of writing a to_aux subroutine.

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