Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Vertex Trigger based on Cylindrical Multiwire Proportional Chambers   The article describes the technical implementation and the performance of the
z-vertex trigger (CIP2k), which is part of the H1-experiment at HERA.

33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio