Stellar rejection R vs. quasar completeness for the variability-based NN. Open circles are for known quasars at redshift z below 2.0, squares for those with 2.0 < z < 2.6 and triangles for those with z > 2.6. Filled symbols at R ~ 94.5% and R ~ 99% indicate the location, on these curves, of the selection thresholds used in Sects. 3.1 and 3.2.
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