Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deep Analyses of Nulling in Arecibo Pulsars Reveal Further Periodic
  Behavior   Sensitive Arecibo observations provide an unprecedented ability to detect
nulls for an accurate pulse-modulation quelling (PMQ) analysis. We demonstrate
that a number of conal pulsars show "periodic nulling" similar to the
phenomenon found earlier in pulsar B1133+16.

21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin