p-T phase diagram for CO2

[Fausto A. A. Barbuto]

Hello,

I tried to create a p-T diagram for CO2 similarly to the one

for H2O and shown here:

http://www.coolprop.org/coolprop/HighLevelAPI.html#propssi-function

somewhere 1/3 down from the top of the page.

A working code is gracefully supplied, but when I replace "Water"

by "CO2" in line 7 I get the following (relevant) error messages:

File "C:\Users\faust\OneDrive\Documents\Programs\Python\supercritical.py", line 28, in <module>
    TT.append(Water.melting_line(CP.iT, CP.iP, p))
File "CoolProp\AbstractState.pyx", line 471, in CoolProp.CoolProp.AbstractState.melting_line
  File "CoolProp\AbstractState.pyx", line 473, in CoolProp.CoolProp.AbstractState.melting_line
ValueError: unable to calculate melting line T(p) for polynomial_in_Theta curve for p=611.657; bounds are 517950,8.22736e+08 Pa

I thought I should bring the p-value down to 611.657, but that didn't work either.

I'm particularly interested on the supercritical region.

Thanks a lot.

Fausto