Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nobeyama 45 m Mapping Observations toward Orion A. II. Classification of
  cloud structures and variation of the $^{13}$CO/C$^{18}$O abundance ratio due
  to far-UV Radiation
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg