Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VLT/Uves Observations of the Dla at Z=3.39 towards QSO 0000-2621   UVES observations at ESO/VLT of the DLA at z=3.39 towards QSO 0000-2621
provided refined abundances for Fe, Si, N, Ni, and new abundances for O, Ar, P,
Zn, Cr, H2. These determinations confirm that the system has remarkable
properties with the lowest metallicity, a very low H2 molecular fraction and it
has no detectable presence of dust. The [alpha/Fe-peak] ratio is ~ 0.1
challenging current models of chemical evolution. The O/Ar and O/S ratios are
the same as those observed in BCGs, suggesting a universal IMF.

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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph