Relative flux distribution for a narrow dust ring model in ε Eri with r = 4 au based on the warm component in the infrared excess. Top: thermal emission. Middle: expected scattered intensity 1_disk for g = 0.6. Bottom: polarized intensity Q_ϕ for g = 0.6. The model images are convolved with the PSF of SPHERE/ZIMPOL, normalized to their flux maximum and aligned with the sky coordinate axes.