Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The timing behaviour of radio pulsars   The purpose of this review paper is to summarise the pulsar timing method, to
provide an overview of recent research into the spin-down of pulsars over
decadal timescales and to highlight the science that can be achieved using
high-precision timing of millisecond pulsars.

20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph