Mass Profile in Elliptical Galaxies

[RCopernicus]

We know a fair amount about Spiral Galaxies because we can basically see their guts. Elliptical Galaxies are obscured by the outer shell. Can anyone direct me to some non-theoretical data on the mass (density) profile of Elliptical galaxies (i.e. the amount of mass (or density) at a given radius, R, from the center)?

 

[Vanadium 50]

Ellipticals are not necessarily (or usually) spherical, so R is not a very good variable to discuss their shapes. Neither, really is r, because it depends on z. Also, we don't have a really good 3-d picture of these galaxies because of the unknown viewing angle. There are empirical fits to luminosities like de Vaucouleurs' law.