Galaxy cluster Dark Flow data?

Hi,

Does anyone have data on the mass density & velocity of any Dark Flow
examples? IOW, the amount of mass for a given volume of space, and
it's velocity.

The only data I have on Dark Flow is that a region of space between
constellations Centaurus & Vela are traveling at 600 km/s, but I've
been unable to find enough data to calculate the mass density (mass /
volume).

Even estimates would be helpful.

I appreciate it,
Paul