Enlargement of the optical rest-frame spectrum around the narrow [O ii]λ3727 emission and CaII H and K absorption lines. The BAL I system (blue) consists of the CaH λ3968, CaK λ3934 lines (blueshifted by ~4900 km s-1) and the He i λ3889 line (blueshifted by ~5600 km s-1).
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