Finding chart and the R-band polarization of J0243 (in the center) and three nearby field stars, which are situated at a similar distance according to Gaia parallaxes. The blue bars show the observed polarization of the source and field stars, while the red bar corresponds to the intrinsic polarization of the source from the Robopol observations, taking star #2 as an estimate of the interstellar contribution (see Table 4).