{
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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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        11.923
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      "type": "pL"
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      "description": "rho' = rhoc*(1+sum(n_i*theta^t_i))", 
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      "type": "rhoLnoexp"
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}