Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the photon structure function at ALEPH   The photon structure function F2gamma has been measured with data taken by
the ALEPH collaboration at LEP centre-of-mass energies sqrt s = 91 GeV with <
Q^2 > of 9.9, 20.7 and 284 GeV^2 and sqrt s = 183 GeV with < Q^2 > of 13.7 and
56.5 GeV^2. For the data at sqrt s = 183 GeV a two-dimensional unfolding method
employing the principle of maximum entropy is used, which reduces the errors
compared to one-dimensional methods.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con