Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Electric--field effect on electron-doped infinite-layer
  Sr$_{0.88}$La$_{0.12}$CuO$_{2+x}$ thin films
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph