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Nice code, fast (axisymmetric calculation) and user-friendly.
It would be good to be able to specify more than 2 materials.
Should provide constants (alpha, beta, eta) for some other commonly used materials and media (like air) and/or cite sources on where to get them. Thanks
The software looks good although some basic sketches of the geometries, transducer positioning, materials, axes, naming conventions, etc. should be included in the instructions in order to understand basic examples and develop more advanced ones.