Lightroom Print Mod Brightness equiv?

[howardm]

Has anyone figured out (reverse engineered) the LR Print module Brightness/Contrast sliders under PV2012 ?

By that I mean 'what Develop module tone curve moves effectively duplicate the Bright & Contrast sliders ?'

I figured I'd ask before I try it via print a gradient to file and then reimport them and see what the LAB/RGB #'s (or histograms) are.