Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A high-Q^2 measurement of the photon structure function F_2^gamma at
  LEP2   The photon structure function F_2^gamma has been measured at <Q^2> of 706
GeV^2, using a sample of two-photon events with a scattered electron observed
in the OPAL electromagnetic endcap calorimeter. The data were taken during the
years 1997-1999, when LEP operated at e+e- centre-of-mass energies ranging from
183 to 202 GeV, and correspond to an integrated luminosity of 424 pb^-1. This
analysis represents the highest <Q^2> measurement of F_2^gamma made to date.

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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: cond-mat
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol