The GASS interface is divided into 7 differents tabs. This image shows the main tab, allowing the users to define the general options of GASS.

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It is possible here to set different GASS options such as the working directory, the size of the model, the number of points used in the model, the distance of the source, the isotopic ratio, and the value of the doppler parameter (more informations in the GASS paper).

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This interface also allows to save and load a previous GASS configuration file, useful for retrieving quickly previous studies performed with the code.