Analysis:
We use Python through Jupyter notebooks to analyze the data. A sample notebook is available. To account for the straggling of the alpha particles we sometimes fit to a modified gaussian function, where each side of the peak has a different width. To see an example worksheet, see the <code> block connected to Figure \ref{838083} in the online document, or the accompanying files.
We find, however, that there are large uncertainties in determining the stopping power from the data. This is likely due to too few data points in distance, giving increased uncertainties once a numerical derivative is done.