Peter Donnel developed a diagnostic script for the gyselax/gyselalibxx repository that visualizes the time evolution of plasma moments, including density, parallel velocity, and temperature components, for multiple species. Using Python and scientific computing techniques, he processed HDF5 distribution-function data to compute and plot these moments, enabling both per-species and cross-species comparisons. The script exports plots as PNG files, supporting reproducible analysis and rapid insight generation for plasma experiments. Peter’s work demonstrated depth in data analysis and visualization, delivering a focused, validation-friendly workflow that improves data interpretation speed for researchers working with complex plasma simulation outputs.