Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanoscale changes with low temperature annealing inside composite
  optical fibres   Nanoscale glass milling with mild thermal annealing is proposed and shown to
occur within a tri-material composite W profile optical fibre.

34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci