This preprint has been published in Icarus, please cite the published version below. Mondro, C. A., Moersch, J. E., & Hardgrove, C. (2024). Surface grain size of alluvial fans on Mars from thermal inertia, as an indicator of depositional style. Icarus, 412, 115971, https://doi.org/10.1016/j.icarus.2024.115971.