During April 2025, Bart van Dijk contributed to the SWMFsoftware/BATSRUS repository by addressing a critical issue in the PUI calculation and binning grid. He improved the accuracy of physics simulations by adjusting the VpuiMinSi and VpuiMaxSi parameters and refactoring the set_pui_state routine to use temperature rather than pressure. Working primarily in Fortran and applying expertise in numerical methods and plasma physics, Bart simplified the exponential term in the calculation, which corrected grid configuration and reduced the risk of incorrect PUI states. This work enhanced the reliability and stability of production simulation runs, reflecting strong technical depth.