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Quantization of charge in experimental data


A team of particle physicists are trying to calibrate their detection apparatus. To test their equipment, they graph the number of particles detected as a function of the charge of the particle, where e is the magnitude of an electron's charge.
Bar graph showing number of particles on y axis and charge on x axis. The x axis is labeled with increments 1e, 2e, 3e, and 4e. The detected nuclei have charges clustering around 0.5e, 1.5e, 2.5e, and 3.5e. The number of particles detected for each charge is approximately equal.
Based on the graph, should the physicists be concerned about the equipment, and for what reason?
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