Submillimeter Array Technical Memo #152 version 12.0, describing the underlying physics and usage of am, a software tool for optical depth, radiative transfer, and refraction computations involving propagation through the atmosphere and other media at microwave through submillimeter wavelengths. Application areas include radio astronomy, atmospheric spectral radiometry, and radio spectrum management. The am program and this memo are made available under under the following license: This

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... program containing an atmospheric propagation model for the submillimeter band is a work of the United States and may be used freely, with attribution and credit to the Smithsonian Astrophysical Observatory. The program is intended for educational, scholarly or research purposes. In connection with any commercial use of the program, the user should disclose clearly and conspicuously all of the information contained in the first sentence of this notice.