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This directory contains the model coefficients for the 
model S20A (described in Ekstrom, G. and A Dziewonski,
The unique anisotropy of the Pacific upper mantle,
Nature, 394, 168-172, 1998).

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FILES:

README      -- this file

S20A_SH    --- the Vsh portion of the model S20A
S20A_SV    --- the Vsv portion of the model S20A
S20A_ISO   --- the isotropic component of the model S20A
S20A_ANISO --- the anisotropic component of the model S20A

evals20a.f --- a FORTRAN program which evaluates the model
               at a given depth, latitude and longitude
test_input --- a sample input file for evals20a

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