Velocity and polarization distribution of the Pipe nebula. Color code: blue and red for field groups NS and S, respectively. Central maps: Grayscale maps: top and bottom panels show the regions with ¹³CO v_m1 in the >4 km s^-1 and <4 km s^-1, respectively (fitted to the map by Onishi et al. 1999). The N–S filament is evident in ¹²CO emission (Onishi et al. 1999). Contours: visual extinction map (Lombardi et al. 2006). Levels are 5.5 and 20 mag. Segments: average polarization segment on each observed field (AFG08; Franco et al. 2010). Length is proportional to ⟨ P_deg ⟩. Circles: positions of the embedded dense cores with extinction peaks > 10 mag (Román-Zúñiga et al. 2009, 2010). Lefthand side panels: data averaged over the fields observed by AFG08. Top panel: ⟨ ΔP_ang ⟩ versus ⟨ P_deg ⟩ as in AFG08. Central panels: ⟨ ΔP_ang ⟩ and ⟨ P_deg ⟩ versus ⟨ v_m1 ⟩, where m1 stands for the first-order moment of the ¹³CO emission. Bottom panel: average linewidth of the ¹³CO velocity components as a function of v_i for the different cloud regions. v_i is sampled in 0.25 km s^-1–wide bins. Error bars indicate 1σ dispersion. Righthand side panels: data for every pixel separated by groups. Top panel: P_ang versus P_deg. Bottom panels: P_ang and P_deg versus v_m1.