Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Clusters of Galaxies in the 2dF Galaxy Redshift Survey   The 2dF Galaxy Redshift Survey has obtained 135,000 redshifts for galaxies in
two broad strips. Here we present the first results of a 3-dimensional search
for galaxy clusters based on known 2-dimensional compilations. We derive new
redshifts and velocity dispersions for clusters, assess the level of
contamination in the sample, analyze the accuracy of photometric redshift
estimates and study the space distribution of clusters.

16
The categories of this paper are: stat
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con