Table 1.
Detailed information about the main sample of sources, the P4 and P8 samples, and the C IV BAL troughs in their spectra.
| MAIN SAMPLE | |
| SDSS-I/II spectra | 1543 |
| BOSS spectra | 1654 |
| SDSS-I/II spectra exhibiting C IV BAL troughs | 1319 |
| C IV BAL troughs detected in SDSS-I/II spectra | 1874 |
| P4 SAMPLE | |
| Sources with a disappearing BAL trough | 67 |
| Disappearing BAL troughs in BOSS spectra | 73 |
| Sources belonging to the pristine sample | 4/30 |
| (10−8 ≤ Pχ2 ≤ 10−4) | |
| P8 SAMPLE | |
| Sources with a disappearing BAL trough | 52 |
| Disappearing BAL troughs in BOSS spectra | 56 |
| Sources belonging to the pristine sample | 26/30 |
Notes. The main sample consists of all the sources for which at least a pair of spectra (one from SDSS-I/II and one from BOSS) is available and where at least one C IV BAL trough is detected in the SDSS-I/II spectrum/spectra.
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