WHERE the stars listed by Cocconi and Morrison are referred to in our article, 10 light years was erroneously written for 15 light years as noted by Dr. van de Kamp. Even this is not strictly correct, since one of the distances is as large as 16.5 light years. But these differences are not crucial for our purposes.
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TOWNES, C., SCHWARTZ, R. Interstellar and Interplanetary Communication by Optical Masers. Nature 192, 348–349 (1961). https://doi.org/10.1038/192348c0
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