Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the extragalactic background light with H.E.S.S   The imprint of cosmic backgrounds in the gamma ray spectra of blazars has
recently been detected by H.E.S.S. and Fermi-LAT, opening the way to studies of
gamma-ray propagation on cosmological scales. This proceeding discusses the
current constraints on the extragalactic background light (EBL), the effort to
increase the collection of blazars detected at TeV energies, and a crucial part
of the science case of next-generation instruments: gamma-ray cosmology.

19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg