Why use pyAMARES? _________________ **Open Access:** 1. **Free and Open Source**: PyAMARES is a free, open-source MRS fitting tool. 2. **Standalone or Integrated**: It functions as a standalone program or can be integrated into existing MRS processing pipelines. 3. **Runs on Multiple Platforms**: Local PCs; Web-based platforms like Google Colab; Remote Linux servers **Flexibility:** 1. **Customizable Parameters**: Easily fix or fit any parameters. 2. **Mathematical Constraints**: Use mathematical expressions to constrain parameters. 3. **Advanced Controls**: Complex constraints; Objective functions; Convergence thresholds **User-Friendly:** 1. **Easy Installation and Operation** 2. **Editable Parameters**: Parameters can be edited via spreadsheet software like Excel or Open Office. **Versatile Fitting Capabilities:** 1. **Optional Prior Knowledge**: Capable of fitting MRS data even with unknown species. 2. **Frequency-Selective AMARES Algorithms**: Features frequency-selective AMARES algorithms.