Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Star clusters in the Carina complex: UBVRI photometry of NGC3114,
  Collinder228 and vdB-Hagen99   In this paper we present and analyze CCD $UBVRI$ photometry in the region of
the three young open clusters NGC 3114, Collinder~228, and vdB-Hagen~99,

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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys