{
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      "type": "pV"
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      "description": "rho'' = rhoc*exp(Tc/T*sum(n_i*theta^t_i))", 
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      "max_abserror_percentage": 0.29909362956086483, 
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      "type": "pL"
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    "rhoL": {
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      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
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      "using_tau_r": false, 
      "max_abserror_percentage": 4.0038317449825893, 
      "t": [
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      "type": "rhoLnoexp"
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}