Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Type II Cepheids as Extragalactic Distance Candles   Extragalactic Type II Cepheids are tentatively identified in photometric
surveys of IC 1613, M33, M101, M106, M31, NGC 4603, and the SMC. Preliminary
results suggest that Type II Cepheids may play an important role as standard
candles, in constraining the effects of metallicity on Cepheid parameters, and
in mapping extinction.

31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th