ADDITIONS AND CORRECTIONS 6699i.e., by 20%. To correct this error: seven lines below the Bo formula read Garom = +2.7 X in the second line from the bottom read +3.7 p.pm.; in the first full paragraph of col. 2, line 7, read "separated by about 1.2 A," The empirical adjustment made in col. 2 and corrected above considerably reduces the effect of the 20'3. . error on all further calculations. The rest of the calculations are affected only very slightly, and the conclusions not at al1.-
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