Top: spectroscopic visible (black line) and NIR (gray lines) linear polarization degree of the earthshine obtained on 2013 May 18. Region B (see text) lies spatially near the location of the optical observations; region A includes the Moon terminator. Middle: spectroscopic visible and NIR linear polarization degree of observed polarized and non-polarized standard stars (black lines). Literature photometric polarimetry (Schmidt et al. 1992; Whittet et al. 1992) is plotted as white diamonds, and gray horizontal error bars represent the filter widths. Bottom: spectroscopic polarization vibration angle of the earthshine and polarized standard stars. Symbols are as in previous panels. In all panels, wavelengths strongly affected by telluric absorption are removed.