  It is shown that above the temperature of maximum abundance, recombination
rates into the excited states of He-like ions that are calculated using
earlier, more approximate methods differ markedly from rates obtained from
recent distorted-wave and R-Matrix calculations (unified recombination rate
coefficients) for Ca, Fe, and Ni. The present rates lead to G ratios that are
greatly lower than those resulting from the more approximate rates in previous
works, by up to a factor of six at high electron temperatures. Excellent
agreement between the distorted-wave and the R-Matrix rates, as well as
excellent agreement in the G ratios calculated from them, provides support for
the accuracy of these new values which have a broad applicability to the
modelling and interpreting of X-ray spectra from a variety of astrophysical and
laboratory sources.
