Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: An ultra-high vacuum scanning tunneling microscope operating at
  sub-Kelvin temperatures and high magnetic fields for spin-resolved
  measurements
1
The categories of this paper are: cs
2
The categories of this paper are: math
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph