Possible biases arising from doing a Hubble measurement with tracers within some volume, neglecting complex cosmic flows effect. We show in red solid line the mean systematic bias for a Hubble measurement per tracer located within a sphere of radius R. The grey area corresponds to the expected 1σ fluctuation per tracer of that same measurement. We show, for reference, the measurement by Riess et al. (2016; in blue and shade of blue for the 1σ limit) of the Hubble constant relatively to the Planck one (centred on zero, and shade of green for the 1σ limit).