Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Aspects code for probabilistic cross-identification of astrophysical
  sources: documentation and complements   Aspects ([asp{\epsilon}], "ASsociation PositionnellE/ProbabilistE de
CaTalogues de Sources" in French) is a Fortran 95 code for the
cross-identification of astrophysical sources. Its source files are freely
available.
  Given the coordinates and positional uncertainties of all the sources in two
catalogs K and K', Aspects computes the probability that an object in K and one
in K' are the same or that they have no counterpart. Three exclusive
assumptions are considered: (1) Several-to-one associations: a K-source has at
most one counterpart in K', but a K'-source may have several counterparts in K;
(2) One-to-several associations: the same with K and K' swapped; (3) One-to-one
associations: a K-source has at most one counterpart in K' and vice versa.
  To compute the probabilities of association, Aspects needs the a priori (i.e.
ignoring positions) probability that an object has a counterpart. The code
obtains estimates of this quantity by maximizing the likelihood to observe all
the sources at their effective positions under each assumption. The likelihood
may also be used to determine the most appropriate model, given the data, or to
estimate the typical positional uncertainty if unknown.

24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex