{
    "property-id" "tag:staff@noreply.openkim.org,2014-04-15:property/structure-rhombohedral-crystal-npt"
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    "species" {
        "source-value" [
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        ]
        "source-unit" "GPa"
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        "source-value" 0
        "source-unit" "K"
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    "a" {
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        "source-unit" "angstrom"
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    "alpha" {
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        "source-unit" "degree"
    }
}