  We study experimentally-using Janus colloids-and theoretically-using Active
Brownian Particles- the sedimentation of dilute active colloids. We first
confirm the existence of an exponential density profile. We show experimentally
the emergence of a polarized steady state outside the effective equilibrium
regime, i.e. when v_s is not much smaller than the propulsion speed. The
experimental distribution of polarization is very well described by the
theoretical prediction with no fitting parameter. We then discuss and compare
three different definitions of pressure for sedimenting particles: the weight
of particles above a given height, the flux of momentum and active impulse, and
the force density measured by pressure gauges.
