CoolProp fails when calculating saturation lines for Solkatherm: Error using ==> PropsSI CoolProp Error: Error in ==> Ts_diagram at 26 s_l = PropsSI('S','T',TT,'Q',0,fluid{ff});

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What temperature causes this failure? It's a pseudo-pure fluid, so stay away from the critical point, we don't really understand the behavior in the critical region.