PIP

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G. Venkatarathnama and L.R. Oellrich 2010
http://dx.doi.org/10.1016/j.fluid.2010.12.001

[thorade]

Also interesting: Fig 10 suggests to use (dbeta/dT)_p as an extension of the p_sat line into the supercritical region. Such an extension was also discussed by Baehr (see #13)