Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Air Shower Simulations with the AIRES System   A report on the characteristics of ultra-high energy air showers simulated
with the AIRES program is presented. The AIRES system includes a fast
simulating program which is an improved version of the well-known MOCCA
program. The AIRES algorithms are briefly described and a series of results
coming from the simulations are analyzed.

23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph