Polarimetric properties of A0620−00. Panel (a): Energy dependence of flux (F_ν), as in Fig. 6 but only the data from this paper are shown. Panels (b) and (c): Energy dependence of the intrinsic PD and PA of A0620−00. Circles and squares correspond to optical observations from this paper and NIR polarimetric observations from Russell et al. (2016), respectively. The blue line corresponds to the model with two polarized components described in Sect. 4.1. Dashed green lines correspond to the constant polarization model.