Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Scalings of Rayleigh-Taylor Instability at Large Viscosity
  Contrasts in Porous Media"   Comment on "Scalings of Rayleigh-Taylor Instability at Large Viscosity
Contrasts in Porous Media" (N. Sabet, H. Hassanzadeh, A. De Wit, and J. Abedi
(2021) Phys. Rev. Lett. 126:094501).

19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat