Y i 6435 andY i 6795 Å lines in B-128. Dotted black line: UVES spectrum; red solid lines: synthetic spectra computed with different [Y/Fe] values as indicated in the panels; blue solid lines: best fits; for the YI 6435 Å line both [Y/Fe] = +0.3 and +0.4 are in blue, and [Y/Fe] = +0.35 was adopted.
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