Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematic Evidence for Superbubbles in I Zw 18: Constraints on the Star
  Formation History and Chemical Evolution   We have combined measurements of the kinematics, morphology, and oxygen
abundance of the ionized gas in \IZw18, one of the most metal-poor galaxies
known, to examine the star formation history and chemical mixing processes.

13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci