Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical models for the dust in RCW 120   The interstellar bubble RCW 120 seen around a type O runaway star is driven
by the stellar wind and the ionising radiation emitted by the star. The
boundary between the stellar wind and interstellar medium (ISM) is associated
with the arc-shaped mid-infrared dust emission around the star within the HII
region.

25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th