Wrong y limits

[rafaelpap]

Dear Sir,
if the first component has a pure vapor pressure greater than the vapor pressure of the second component the y limits are computed incorrectly.

I suggest to change

125c125
<                           ylim = (0,pressure_vapor[-1]*1.2),
---
>                           ylim = (0,max(pressure_vapor)*1.2),

Thanks for the attention.