Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi Object Spectrograph of the Fireball-II Balloon Experiment   Fireball-II is a NASA/CNES balloon-borne telescope and MOS to study faint
diffuse emissions of galaxies in the space ultraviolet. The MOS is based on two
identical reflective Schmidt systems sharing an plane-aspherized grating
obtained by active optics methods.

25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas