  We point out that the instantaneous shear modulus of the shoving model for
the non-Arrhenius temperature dependence of viscous liquids' relaxation time is
the experimentally accessible high-frequency plateau modulus, not the idealized
instantaneous affine shear modulus that cannot be measured. Data for a large
selection of metallic glasses are compared to three different versions of the
shoving model. The original shear-modulus based version shows a slight
correlation to the Poisson ratio, which is eliminated by the energy-landscape
formulation of the model in which the bulk modulus plays a minor role.
