Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reconstruction accuracy of the surface detector array of the Pierre
  Auger Observatory   The reconstruction of extensive air showers (arrival direction, core position
and energy estimation) by the surface detector of the Pierre Auger Observatory
is discussed together with the corresponding accuracy. We determine the angular
reconstruction accuracy as a function of the station multiplicity by using two
different aproaches. We discuss statistical and systematic uncertainties in the
determination of the signal at 1000 m from the core, S(1000), which is used to
estimate the primary energy.

13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th