Table 1.
Number of spectra resulting from the various selection cuts.
| Sample | Number of objects |
|---|---|
| Parent sample | 750 414 |
| zquasar > zcluster and up to 3 × R200c | 434 736 |
| MgII range and zquasar < 5 | 18 694 |
| High-quality SDSS spectra | 16 224 |
Notes. Table 1 cuts: (i) the quasar redshift must be higher than the redshift of the intervening cluster; (ii) the corresponding MgII absorption line should fall within the SDSS wavelength coverage and the quasar redshift must be z < 5; and (iii) the final spectrum must be free of wavelength gaps and other errors.
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