Soft and hard XGPS log N(> S) − log S curves after subtracting the ASCA extragalactic contribution (EG) (thick black lines). The contribution of different categories of source are also shown as follows: identified stars (red, see text); accreting candidates (green); and all identified (blue). The dashed lines show the result of also including matches with USNO-B1.0 and 2MASS which have probabilities higher than 90% to the assumed stellar (red) and total (blue) identifications. The upper magenta dashed line shows the sum of all spectroscopically identified sources added to sources with an individual probability  >50% to be positively associated with a USNO-B1.0 or 2MASS entry.