Polarization vectors of the 19 quasars with p ≥ 0.6% are superimposed on the large-scale structure after rotation of the polarization angles according to . A clear correlation is seen but we nevertheless caution against exaggerated visual impression since polarization angles are now in the range [90–180°]. Right ascensions and declinations are in degree. The comoving distance scale is indicated as in Fig. 4.