HI column density maps of the mIVC for EBHIS (top left), WSRT (top right), and the combined HI map (bottom left). The column densities are calculated for channels with −56.5 km s^-1 ≲ v_LSR ≲ −20.4 km s^-1. At the bottom right the Planck τ data is shown. The black circle marks the position and extent of the WSRT pointing. The colour-scaling is the same for the EBHIS and the combined map. The beam size of each map is given in the bottom-left corner.