I found the spreadsheet I used tucked away in a google drive directory. Here it is but with the numerical data points shown. Column A is the pressure in microns and column B is computed/observed boiling temps in C. Zero microns is a theoretical perfect vacuum and 760,000 microns is typical room pressure.
Understand this is a crude chart. It is based on observation and extrapolation and likely needs refinement. Look at the computed boiling point at room pressure lolz. It is just under a butane torch temp! Anyway it is a start and believe it’s accuracy improves the closer you get to one micron which is where I made direct observations.