Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flux ratio [Ne V] 14.3/24.3 as a test of collision strengths   From ISO [Ne V] 14.3/24.3 micron line flux ratios, we find that 10 out of 20
planetary nebulae (PNs) have measured ratios below the low-electron density
(N_e) theoretical predicted limit. Such astronomical data serve to provide
important tests of atomic data, collision strengths in this case. In principle,
well-calibrated measurements of the [Ne V] 14.3/24.3 flux ratio could improve
upon the existing atomic data.

9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph