import CoolProp
state = CoolProp.AbstractState("REFPROP", "ISOBUTAN&PROPANE")
state.set_mass_fractions([0.8,0.2])
import matplotlib.pyplot as plt
from CoolPlot.Plot.Plots import PropertyPlot
fig = plt.figure()
plot = PropertyPlot(state, 'TS', unit_system='EUR', tp_limits='ACHP', figure=fig)
plot.calc_isolines()
plot.show()