Several of our readers drew our attention to the fact that the definition of AGC speed in the Review Article by Ing. Antonio C. Limón (Geophysics, December, 1964) in Figure 15, page 1043, should read: “FORMULA: υ=Δdbt.” In the given examples Δdb was 20 db, so that the AGC speeds obtained this way should be multiplied by a factor 20/3=6⅔. The editor and the author regret this oversight and can find consolation only in the fact that GEOPHYSICS has an alert readersphi.

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