  An improved analysis of the Michelson-Morley-type experiment by P. Antonini
et al. (Phys. Rev. A. 71, 050101 (2005)) yields the Robertson-Mansouri-Sexl
theory parameter combination $\beta-\delta-1/2=(-0.6\pm 2.1\pm
1.2)\cdot10^{-10}$ and the Standard Model Extension theory parameter
$(\tilde{\kappa}_{e-})^{ZZ} = (-2.9\pm 2.2)\cdot 10^{-14}$.
