Void-galaxy cross-correlation function, as measured in the mock catalogues (left panel) and in the VIPERS data (right panel). Measurements were made in ten radial bins and in six angular bins. The axes plotted correspond to the tangential, θ, and line of sight, π, directions. The enhancement in the line of sight direction, visible in both the mock catalogues and in the data, is evidence of redshift space distortions caused by linear outflows.