{
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
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  "CAS": "75-46-7", 
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    "GWP100": 14800.0, 
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      "molar_mass_units": "kg/mol", 
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  "REFPROP_NAME": "R23", 
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  "TRANSPORT": {
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      "hardcoded": "R23"
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    "viscosity": {
      "BibTeX": "Shan-ASHRAE-2000", 
      "hardcoded": "R23"
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}