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We have relaxed YbH2 and BeH2, using crystallographic data to build initial structures in our optimizations. It is important to realize that cubic \u03b2-YbH2 transforms to orthorhombic \u03b1-YbH2 below 125\u00a0\u00b0C, yet \u201cthe difference in free energies between the two forms is extremely small\u201d [18a]. 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