We reproduce here Fig. 3 from that paper in its correct originally submitted form, which also appeared in the proof sent to the author. Subsequently, in their desire for a more uniform typographical style, the figure was altered by the American Institute of Physics staff at Woodbury, New York, without consultation with either the author or the editor. In so doing the letters indicating the figure sub‐units were pasted back in the wrong order. The Woodbury staff has apologized to the author for this regrettable error. That apology is hereby transmitted to the readers of this Journal.
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© 1992 American Association of Physics Teachers.
1992
American Association of Physics Teachers
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