Although the focus of modern global seismology is more on 3D modeling and heterogeneous fine structures than on 1D averages, the evaluation of globally averaged 1D models is still an important task. Studies of spatial variations usually look at deviations from the average rather than modeling absolute values of physical properties. The accurate computation of body-wave travel times for average models is thus a routine task in many applications.

To prove the accuracy of a given computer program for travel-time computation, it is necessary to have a reliable standard against which the software can be tested. An analytical solution is...

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