Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photospheric Abundances: Problems, Updates, Implications   Current problems encountered in the spectroscopic determination of
photospheric abundances are outlined and exemplified in a reevaluation of C, N,
O, Ne, Mg, Si, and Fe, taking effects of NLTE and granulation into account.
Updated abundances of these elements are given in Table 2.
  Specific topics addressed are (1) the correlation between photospheric matter
and CI chondrites, and the condensation temperature below which it breaks down
(Figure 1), (2) the question whether the metallicity of the Sun is typical for
its age and position in the Galaxy.

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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: physics