Left: EBHIS column density map N^HVC of the HVC (−230 km s^-1<v_LSR< −190 km s^-1). Center: EBHIS column density map N^local of the local foreground emission (−190 km s^-1<v_LSR< + 30 km s^-1). Right: FIR intensity I_{857 GHz} from Planck Collaboration VIII (2016). The inner white contour line corresponds to the 5σ noise level in the HVC column density map. The outer contour marks an annulus that contains the same number of pixels as the tight HVC mask.