Corrections

February, page 33: Reference in first column, next‐to‐last line should be “5,6” not “5,3.” In figure 1 add “1 MeV” midway between “1 keV” and “1 GeV.”

—page 34: The lifetime of 6.8 microsec should apply to the first excited state of $Ta181,$ shown in color.

—page 35: In figure 3, the laser and its first mirror images should be equally spaced from the mirrors; in figure 4 the point for $Ir191$ should lie on the slanting red line.