Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Uuniversity of Durham Mark 6 Gamma Ray Telescope   The design, construction and operation of the University of Durham
ground-based gamma ray telescope is discussed. The telescope has been designed
to detect gamma rays in the < 200 GeV region and to achieve good discrimination
between gamma ray and hadron initiated showers in the higher energy region (>
300 GeV). The telescope was commissioned in 1995 and a description of its
design and operation is presented, together with a verification of the
telescope's performance

8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph