[
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        }
    } 
    {
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        "prototype-label" {
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            "source-unit" "eV/angstrom^3" 
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        "temperature" {
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            "source-unit" "K" 
            "si-unit" "K" 
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        } 
        "coordinates-file" {
            "source-value" "instance-2.poscar"
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    }
]