  We explore and describe different protocols for calibrating electron pair
distribution function (ePDF) measurements for quantitative studies on
nano-materials. We find the most accurate approach to determine the
camera-length is to use a standard calibration sample of Au nanoparticles from
National Institute of Standards and Technology. Different protocols for data
collection are also explored, as are possible operational errors, to find the
best approaches for accurate data collection for quantitative ePDF studies.
