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Fig. 2

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Distributions of the variables used as input in the ANN for objects classified as PLO in SDSS photometric catalog (blue dotted histogram) and for objects spectroscopically classified as QSO (red slashed histogram): a) Distribution of the PSF g magnitude, b), c), d), e), and f). Distributions of, respectively, σ(u), σ(g), σ(r), σ(i), and σ(z), the errors in the corresponding PSF magnitudes. Note that the g distribution for the QSOs used for the ANN training is biased by the spectroscopic selection. This issue will be addressed in the future with the first observations of BOSS, which would provide a “less biased” training sample.

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