Abstract
The method of identifying absorption line systems in QSO spectra (Cui et al. 1983; Chen et al. 1983) is further developed here. Certain limitations of the method and their improvements are discussed. Certain other problems requiring further study are pointed out. The improved method is applied to PKS 0528-250, and gives two new absorption line systems Z a = 0.065 and 0.0345 in addition to the four systems Z a = 2.8110, 2.8130, 2.5275, 2.1410, consistent with the systems A 1 A 2, B, C of Norton et al. (1980). However, the systems D 1, D 2, E, F and G of Chen and Norton (1984) are not recovered. The reason for this discrepancy is discussed.
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