  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.
