Left: angular separation of X-ray and reference position of identified sources before (dashed blue line) and after (solid black line) boresight correction. Middle: distribution of r/σ, compared with a Rayleigh distribution (blue line). Right: cumulative distribution of angular separation between the XMM-Newton SMC catalogue and the Chandra catalogues of McGowan et al. (2008) in green, Laycock et al. (2010) in red, Nazé et al. (2003) in blue, and Evans et al. (2010) in orange. The cumulative Rayleigh distribution is shown by the black line.