3D Reddening and Extinction Maps at the Beginning of the Gaia Era
  The vast majority of Gaia DR1 Tycho-Gaia astrometric solution (TGAS) stars
are located within a distance of 1200 pc from the Sun and up to 600 pc within
the Galactic plane. Complete usage of their parallaxes is possible only if
their reddening and interstellar extinction are known. We obtained those from a
comparison of the eight most accurate and complete 3D maps of reddening and
extinction in the considered space. We analyzed the statistics of the maps and
their differences in the cells of $20\times20\times20$ pc in the whole
considered space. The comparison of the maps in the cells outside the dust
layer allows us to obtain a formula of the correction for both overestimated
and minimal reddenings of the SFD map through the dust half-layer. We point out
the need for a further study of the minimal reddening through the dust
half-layer and the overestimation of higher reddenings by use of the most
precise data. Based on the data of all the maps under consideration we compile
two catalogues of the reddenings: for 630,109 cells of $20\times20\times20$ pc
in the considered space and for 1,758,723 TGAS stars with the most accurate
distances.
