The average size of the potatoes used in this study was 50 mm across the shortest axis. At the conveyor belt speed used, this should theoretically result in an average of 20 spectra per potato using the current equipment. After extraction of the sample spectra from the conveyor belt, an average of 15–17 spectra were left, hence further indicating that the threshold was effectively removing enough to avoid interference from the conveyor belt and the outermost ends of the potato.