abundances2ratios       Isotope ratios of a chemical element from
                        isotopic abundances
at.weight               Atomic weight and isotopic abundances of a
                        chemical element from isotope ratios
ciaaw.mass.2003         Atomic masses of isotopes (IUPAC/CIAAW 2003)
ciaaw.mass.2012         Atomic masses of isotopes (IUPAC/CIAAW 2012)
ciaaw.mass.2016         Atomic masses of isotopes (IUPAC/CIAAW 2016)
iridium.data            Iridium isotope ratio data from various studies
mmm                     Multivariate meta-analysis of correlated
                        effects
normalize.ratios        Normalize isotope amount ratios to a common
                        reference isotope
platinum.data           Platinum isotope ratio data from various
                        studies
