The absolute double ionization cross sections presented in this paper were calibrated incorrectly. Tables I and II should be replaced with the ones below. The discussion of the data is correct as presented. In particular, the relative values of the cross sections as rejected in the energy dependence are una8'ected. A corrected Fig. 3 shows the interaction distance is about 2.7 times (rather than twice) the mean size of the lo orbital.
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