Radial velocity (cz) with respect to the CMB: v3k

It is calculated from the heliocentric velocity v using the total solar motion of 370.06 km/sec towards the direction defined by Galactic coordinates (263.914°, +48.2646°) (Planck 2015 results):

Other velocities in the database are: vrad, vopt, v, vgsr, vlg, vvir.