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Simulation of the so-called monatomic and diatomic chains by the computerprogram CHAINPLOT is described. The simulation provides useful teachingmaterial for undergraduate condensed matter physics lecture courses, and hasrevealed that for the last 63 years a fundamental description of the actualatomic motions has been copied in the literature, despite being incorrect or atleast misleading..

CHAINPLOT: A Teaching Tool to Demonstrate Vibrations of Atoms on a Chain  and the Cautionary Tale of a Fundamental Error Propagated Over the Last 63  Years