2 OBSERVATIONS AND SAMPLE SELECTION

3 ANALYSIS
3.1 Continuum fits
3.2 Detection of disappearing and emerging BALs

4 RESULTS
4.1 Disappearing and emerging BAL properties
4.2 Re-emerging BAL properties
4.3 Re-disappearing BAL properties
4.4 Properties of BAL quasars with disappearing and emerging BALs

5 DISCUSSION
5.1 The origin of disappearing/emerging BALs
5.2 BAL outflows undergoing ionization changes
5.3 BAL outflows traversing our LOS

6 CONCLUSIONS