Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High excitation ISM and gas   An overview is given of ISO results on regions of high excitation ISM and
gas, i.e. HII regions, the Galactic Centre and Supernovae Remnants. IR emission
due to fine-structure lines, molecular hydrogen, silicates, polycyclic aromatic
hydrocarbons and dust are summarised, their diagnostic capabilities illustrated
and their implications highlighted.

24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th