CO emission observed toward and around the B211 filament (Goldsmith et al. 2008). Redshifted ¹²CO(1–0) emission integrated from V_LSR = 6.6 km s^-1 to V_LSR = 7.4 km s^-1 is displayed in red and mostly seen to the north-east of the B211 filament. Blueshifted ¹²CO(1–0) emission integrated from V_LSR = 4.2 km s^-1 to V_LSR = 5.5 km s^-1 is displayed in blue and mostly seen to the south-west of the filament. The main body of the B211 filament, displayed in green, corresponds to the ¹³CO(1–0) emission detected between V_LSR = 5.6 km s^-1 to V_LSR = 6.4 km s^-1. Both ¹²CO(1–0) and ¹³CO(1–0) maps have a spectral resolution of ~0.2 km s^-1.