Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gaia data release 1, the photometric data   Context. This paper presents an overview of the photometric data that are
part of the first Gaia data release. Aims. The principles of the processing and
the main characteristics of the Gaia photometric data are presented. Methods.
The calibration strategy is outlined briefly and the main properties of the
resulting photometry are presented. Results. Relations with other broadband
photometric systems are provided. The overall precision for the Gaia photometry
is shown to be at the milli-magnitude level and has a clear potential to
improve further in future releases.

7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat