Astrometric accuracy of the sources present in the catalogue measured using the FIRST survey as a reference. The mean errors are E_RA = −0.08" and E_Dec = 0.04" with standard deviation σ_RA = 1.48" and σ_Dec = 1.17". The standard deviation of the distribution is shown with a white dashed line. In the histograms, the black solid lines show Gaussians with the aforementioned means and standard deviations, the red dashed lines indicate the position of the means.