Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: WebPlotDigitizer, a polyvalent and free software to extract spectra from
  old astronomical publications: application to ultraviolet spectropolarimetry   In this contribution, we present WebPlotDigitizer, a polyvalent and free
software developed to facilitate easy and accurate data extraction from a
variety of plot types. We describe the numerous features of this numerical tool
and present its relevance when applied to astrophysical archival research. We
exploit WebPlotDigitizer to extract ultraviolet spectropolarimetric spectra
from old publications that used the Hubble Space Telescope, Lick Observatory 3m
Shane telescope and Astro-2 mission to observe the Seyfert-2 AGN NGC 1068. By
doing so, we compile all the existing ultraviolet polarimetric data on NGC 1068
to prepare the ground for further investigations with the future
high-resolution spectropolarimeter POLLUX on-board of the proposed Large
UV/Optical/Infrared Surveyor (LUVOIR) NASA mission.

28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math