Map of the column density of the IVC in the Cohen Stream field, gas probably associated with the high‐z extension of the Perseus arm, integrating the LAB data of Kalberla et al. (2005) between ﹩v_{\mathrm{LSR}\,}=-80﹩ and −30 km s⁻¹. Contours are at column densities of ﹩1\times 10^{19}﹩, ﹩2\times 10^{19}﹩, and ﹩4\times 10^{19}﹩ cm⁻². The locations of the background stars are overlaid. Symbols are as for Fig. 2.