Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Millennium Arecibo 21-cm Absorption Line Survey: Extolling the
  Analysis Procedures   We have recently completed the analysis of a survey of the HI line in
emission/absorption against 79 radio sources. Our CNM temperatures are about
half those of previous authors and we find a substantial quantity of thermally
unstable WNM. These results are somewhat controversial. Here we discuss the
analysis procedures to illustrate explicitly why the results are reliable.

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The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg