Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Radiative hydrodynamics simulations of red supergiant stars. IV gray
  versus non-gray opacities
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
1
The categories of this paper are: cs
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int