Fig. 21

image

Distribution of the angular separation of 1RXS (red) and 2RXS (blue) sources from nearest Tycho-2 catalogue entries. Statistical values for mean and median are computed below 40 arcsec (chance coincidences start to dominate above 40 arcsec, but have not been subtracted here). No selection on Tycho-2 positional errors has been performed in this plot.

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