THat chart says the same thing, the higher the temperature, the higher the vapor pressure. The chart just ends but I would assume if you heat butane over 140 the vapor pressure goes even higher :-)

Here is a definition that might help.

http://www.ilpi.com/msds/ref/vaporpressure.html


Definition
The vapor pressure of a liquid is the pressure exerted by its vapor when the liquid and vapor are in dynamic equilibrium.
If we were to place a substance in an evacuated, closed container, some of it would vaporize. The pressure in the space above the liquid would increase from zero and eventually stabilize at a constant value, the vapor pressure.

It is important to specify the temperature when stating a vapor pressure because vapor pressures increase with temperature. Also, be aware that there are several different units for pressure.

Finally, recognize that liquids that aren't in a closed container still have a vapor pressure. However, the material will eventually evaporate or vaporize (turn into a gas) completely.