Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: IVOA Recommendation: Simple Spectral Lines Data Model Version 1.0   This document presents a Data Model to describe Spectral Line Transitions in
the context of the Simple Line Access Protocol defined by the IVOA (c.f.
Ref[13] IVOA Simple Line Access protocol) The main objective of the model is to
integrate with and support the Simple Line Access Protocol, with which it forms
a compact unit. This integration allows seamless access to Spectral Line
Transitions available worldwide in the VO context. This model does not provide
a complete description of Atomic and Molecular Physics, which scope is outside
of this document. In the astrophysical sense, a line is considered as the
result of a transition between two energy levels. Under the basis of this
assumption, a whole set of objects and attributes have been derived to define
properly the necessary information to describe lines appearing in astrophysical
contexts. The document has been written taking into account available
information from many different Line data providers (see acknowledgments
section).

34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg