[C ii] longitude-velocity (l-V) map covering ~15° in longitude over the range to 341.̊4 at b = 0.̊0. The intensities are in main-beam antenna temperature (T_mb) with values indicated by the color wedge. A square-root color stretch is used to bring out the low-brightness emission features. The velocity resolution in all maps is 2 km s^-1 and the beam size along the longitudinal direction is 80′′. A sketch of the spiral arms in the fourth quadrant, adopted from Vallée (2008), is overlaid and indicated in the following colors: red-solid: Norma-Cygnus; white-solid: Scutum-Crux; white-dashed: Sagittarius-Carina; red-dashed: Perseus. The rectangular boxes indicate the extent of the spiral tangencies as labeled.