{
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      "type": "rational_polynomial"
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      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
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      "max_abs_error_units": "J/mol/K", 
      "type": "rational_polynomial"
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      "type": "rational_polynomial"
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
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  "CAS": "75-45-6", 
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    "FH": 1, 
    "GWP100": 1810.0, 
    "GWP20": 5160.0, 
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      "gas_constant_units": "J/mol/K", 
      "molar_mass": 0.086468, 
      "molar_mass_units": "kg/mol", 
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  "NAME": "R22", 
  "REFPROP_NAME": "R22", 
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}